Ford F-250 Super Duty Gen 4 Transmission Guide (2017-2022)

The Gen 4 Ford F-250 Super Duty, produced from 2017 to 2022, uses a range of transmissions paired with different engine options. These transmissions are designed to handle the increased towing capacity and power of the newer Super Duty trucks, and improvements in performance, reliability, and technology were key focuses for this generation.

Overview

Each transmission type was designed to handle the unique needs of the Gen 4 F-250 Super Duty while also offering improved fuel efficiency, better towing capabilities, and enhanced performance. The 10R140 transmission in particular stands out for its additional gears and improvements over the older 6-speed models, offering better handling of the high torque generated by modern diesel engines. Here’s an overview of the transmissions used in the Gen 4 F-250 Super Duty:

6R140 (TorqShift 6) – 6-Speed Automatic (until 2019)

• Engine Pairing:
  • 6.2L V8 Gasoline Engine
  • 6.7L Power Stroke V8 Turbo Diesel Engine
• Transmission Type: 6-speed automatic
• Purpose: Primarily used in the F-250 with the gas V8 engine and diesel engines in the F-250 and F-350 models.
• Torque Rating: Up to 1,000 lb-ft of torque (especially with the diesel engine).
• Features:
  • Offers smooth shifting for heavy-duty applications.
  • Advanced tow/haul modes for better handling of heavy loads.
  • Adaptive learning technology for better performance.

10R140 (TorqShift 10) – 10-Speed Automatic (starting 2020)

• Engine Pairing:
  • 7.3L V8 Gasoline Engine
  • 6.7L Power Stroke V8 Turbo Diesel Engine

• Transmission Type: 10-speed automatic
• Purpose: The newer 10-speed transmission was introduced for increased fuel efficiency and improved towing capacity, particularly with the 7.3L gasoline engine and the updated 6.7L Power Stroke diesel.
• Torque Rating: Up to 1,200 lb-ft of torque (with the latest diesel engine).
• Features:
  • Offers improved fuel economy through more gear ratios, which means the engine can operate more efficiently at varying speeds.
  • Enhanced towing and hauling capabilities, especially in diesel variants.
  • Allows for quicker acceleration and better overall performance.

Gen 4 Super Duty Transmission Specs

The key differences between the 6R140 (TorqShift 6) & 10R140 (TorqShift 10) transmissions in the Gen 4 Ford F-250 Super Duty revolve around their gear count, engine pairing, performance capabilities, and fuel efficiency. Here’s a breakdown of the main distinctions:

6R140 (TorqShift 6) – 6-Speed Automatic Transmission

• Gear Count: 6 gears
• Engine Pairing:
  • 6.2L V8 gasoline engine
  • 6.7L Power Stroke V8 turbo diesel engine
• Torque Capacity: Up to 1,000 lb-ft (mostly with the diesel engine).
• Performance:
  • Known for reliable performance in heavy-duty applications like towing and hauling.
  • Smooth shifting but fewer gears compared to newer transmissions, which may impact overall performance in certain scenarios.
  • Tow/haul modes enhance towing capabilities, especially in heavy-duty trucks.
• Fuel Economy: Generally lower than the 10-speed transmission due to fewer gears for optimization at varying speeds.
• Introduced: This transmission was common in earlier models of the Gen 4 Super Duty, used in both gas and diesel engine variants.
• Gear Ratios:
  • 1st Gear Ratio: 4.17:1
  • 2nd Gear Ratio: 2.34:1
  • 3rd Gear Ratio: 1.52:1
  • 4th Gear Ratio: 1.14:1
  • 5th Gear Ratio: 0.86:1
  • 6th Gear Ratio: 0.69:1
  • Reverse Gear Ratio: 3.23:1
• Cooling: Integrated cooler for heavy-duty towing
• Max Towing Capacity: Up to 18,500 lbs (depending on configuration)
• Application: Paired with 6.2L V8 Gasoline Engine and 6.7L Power Stroke V8 Turbo Diesel Engine
• Transmission Fluid: Mercon LV ATF
• Performance Features:
  • High-torque handling for heavy-duty performance
  • Smooth shifting for workhorse applications
• Designed for durability and strength under load

10R140 (TorqShift 10) – 10-Speed Automatic Transmission

• Gear Count: 10 gears
• Engine Pairing:
  • 7.3L V8 gasoline engine
  • 6.7L Power Stroke V8 turbo diesel engine
• Torque Capacity: Up to 1,200 lb-ft (especially with the updated 6.7L Power Stroke diesel).
• Performance:
  • Significant improvement over the 6-speed transmission, offering more gears for better power delivery and responsiveness.
  • Enhances acceleration and maintains engine efficiency at different speeds.
  • Improved towing capacity and smoother shifting compared to the 6-speed transmission.
• Fuel Economy: Better fuel economy compared to the 6-speed transmission, due to more gears that optimize engine power and speed across various driving conditions.
• Introduced: The 10-speed transmission began appearing in 2020+ F-250 Super Duty trucks, paired mostly with the 7.3L V8 gasoline and the latest 6.7L diesel engines.
• Technology: Offers adaptive learning, which allows it to adjust to driving style and load conditions, providing optimal shifting performance.
• Gear Ratios:
  • 1st Gear Ratio: 4.69:1
  • 2nd Gear Ratio: 3.09:1
  • 3rd Gear Ratio: 2.34:1
  • 4th Gear Ratio: 1.83:1
  • 5th Gear Ratio: 1.53:1
  • 6th Gear Ratio: 1.27:1
  • 7th Gear Ratio: 1.00:1
  • 8th Gear Ratio: 0.84:1
  • 9th Gear Ratio: 0.69:1
  • 10th Gear Ratio: 0.63:1
  • Reverse Gear Ratio: 4.79:1
• Manufacturer: Ford, developed in collaboration with General Motors
• Torque Capacity: 1,400 lb-ft
• Gears: 10 forward gears
• Torque Converter: Dual-stage, lock-up
• Shifting Type: Electronically controlled
• Cooling: Integrated heavy-duty cooler for optimal towing performance
• Max Towing Capacity: Up to 37,000 lbs (when properly equipped with the 6.7L Power Stroke diesel engine)
• Application: Paired with 7.3L V8 Gasoline Engine and 6.7L Power Stroke V8 Turbo Diesel Engine
• Transmission Fluid: Mercon ULV ATF
• Performance Features:
  • Provides a more refined driving experience compared to the 6-speed transmission
  • Improved towing capabilities and fuel efficiency
  • Enhanced shift logic for smoother gear changes
  • Optimal performance for both high-torque diesel and gasoline engines

Performance Optimization:

• 6R140 (6-speed) was designed for durability and strength, making it ideal for heavy-duty applications, especially when paired with the 6.7L Power Stroke diesel.
• 10R140 (10-speed) maximized fuel efficiency and towing performance, offering smoother shifting, better power delivery, and improved fuel economy, especially when paired with the 6.7L diesel and 7.3L gasoline engines.

In conclusion, the pairing of these transmissions with the engines in the Gen 4 F-250 Super Duty trucks was carefully done to optimize performance, towing capacity, and fuel efficiency for various customer needs, with the 10R140 being the most advanced for both gas and diesel engine pairings.

Torque Converters

6R140 (2017-2020)

• 6.2L V8 Gasoline Engine: Paired with the TorqShift-G 6-speed automatic transmission, which incorporated a torque converter designed for improved efficiency and weight savings.
• 6.7L Power Stroke Diesel Engine: Mated to the 6R140 6-speed automatic transmission, featuring a heavy-duty torque converter capable of handling substantial torque loads.
• Torque Converter Models:
  • HC3Z-7902-B
  • HC3Z-7902-ARM (Remanufactured)
  • PC3Z-7902-C

10R140 (2020-2022)

• 6.2L V8 Gasoline Engine: Continued with the 6R140 6-speed automatic transmission, maintaining the same torque converter setup as previous years.
• 7.3L V8 Gasoline Engine (“Godzilla”): Introduced in 2020, this engine was coupled with the 10R140 10-speed automatic transmission, which included a torque converter engineered for enhanced performance and durability.
• 6.7L Power Stroke Diesel Engine: Also transitioned to the 10R140 10-speed automatic transmission starting in 2020, utilizing a torque converter designed to manage increased torque output and improve towing capabilities.
• Torque Converter Models:
  • LC3Z-7902-F
  • LC3Z-7902-G
  • LC3Z-7902-B

There are multiple aftermarket torque converters available,  but for the purposes of this post, we will stick to OEM only.

Transfer Cases

Between 2017 and 2022, Ford equipped the F-250 Super Duty trucks with BorgWarner transfer cases, specifically the BW4464 and BW4465 models. These transfer cases are part-time, chain-driven units designed to handle the demands of heavy-duty applications.

BW4464:

• Applications: Primarily used in F-250 models equipped with the 6.2L V8 gasoline engine and the 6-speed automatic transmission (6R140).
• Features: Electronic shift-on-the-fly capability with a rear slip yoke design.
• OEM Part Numbers: Examples include HC3Z-7A195-GM and HC3Z-7A195-G, as seen in listings for used assemblies.

BW4465:

• Applications: Typically found in F-250 models equipped with the 6.7L Power Stroke diesel engine and the 10-speed automatic transmission (10R140).
• Features: Enhanced torque capacity to accommodate the higher output of the diesel engine.

Both transfer cases offer high and low gear ranges and are designed for durability in demanding conditions. The choice between BW4464 and BW4465 depends on the specific engine and transmission pairing in the vehicle.

Figuring Out Which Transmission You Have

Check the Vehicle Identification Number (VIN)

• What to do: Locate your truck’s VIN, which is a unique 17-character code that identifies your vehicle.
  • The VIN is usually found on:
    • The driver’s side dashboard (visible through the windshield).
    • The driver’s side door frame (on the label near the door latch).
  • The 8th character of the VIN typically indicates the engine type, and the 10th character represents the model year.
• How this helps: Once you have your VIN, you can decode it to find out specific details about your truck, including the transmission. There are online VIN decoder tools that will tell you the type of transmission used in your F-250 based on the VIN.

Transmission Identification Tag

• What to do: If the VIN doesn’t help you or if you want more direct information, check for the transmission identification tag or stamped number on the transmission itself.
  • For 6R140 (TorqShift 6): Look for a metal tag on the transmission housing, usually located on the side or rear.
  • For 10R140 (TorqShift 10): The tag may be on the side or top of the transmission case.
• How this helps: This tag typically has the model number, serial number, and other identifying details that will allow you to verify which transmission you have.

Check Your Owner’s Manual

• What to do: Consult your Ford F-250 Super Duty owner’s manual to check the specifications for your vehicle.
  • Ford provides detailed information about the specific transmission paired with the engine options for each model year and trim.
• How this helps: The owner’s manual will tell you which transmission is paired with the engine in your truck (e.g., 6R140 paired with the 6.7L PowerStroke Diesel or 10R140 paired with the 7.3L Gas engine).

Transmission Fluid Dipstick (if applicable)

• What to do: Some trucks have a transmission fluid dipstick (though newer models often don’t, as they are sealed systems).
  • If you do have one, you can sometimes find identifying marks or tags on the dipstick or its tube.
• How this helps: The dipstick may have markings or part numbers that correspond to the specific transmission type, which can be cross-referenced to determine which transmission is in your truck.

Check the Transmission Control Module (TCM)

• What to do: If you have access to diagnostic tools (such as an OBD-II scanner or Ford IDS system), you can scan for fault codes or check the transmission control module (TCM) settings.
• How this helps: The TCM will provide specific information about the transmission model, including its calibration and configuration.

Check the Gear Shift Pattern

• What to do: Some transmissions may have distinct gear shift patterns or features that make them identifiable.
  • For example, the 6R140 may have different shift points compared to the 10R140, which would be noticeable during shifting behavior.
• How this helps: While this isn’t as precise as other methods, the number of gears and the overall driving experience can give clues to which transmission is in your truck.

Consult a Ford Dealership (last resort)

• What to do: If you’re still uncertain, visit your local Ford dealership or service center. Provide them with your VIN, and they can quickly tell you which transmission is in your truck based on their database.
• How this helps: The dealership can access Ford’s systems to provide you with the most accurate and up-to-date information about your truck’s specifications.

Parts of The Transmission

The parts used in these transmissions vary depending on the specific transmission, but below is a general breakdown of the key components commonly found in these systems:

6R140 TorqShift 6-Speed Automatic Transmission (2017-2022)

The 6R140 is a heavy-duty 6-speed automatic transmission found in most 2017-2022 Ford F-250 Super Duty trucks with the 6.7L PowerStroke Diesel engine.

Key Parts:

• Torque Converter: Transfers power from the engine to the transmission.
• Planetary Gear Sets: Used for gear reduction and torque multiplication.
• Clutch Packs: Engages and disengages the gears to shift.
• Bands: Control the planetary gears in specific gears (used for holding or releasing gearsets).
• Valve Body: Directs hydraulic fluid to the appropriate clutch packs and valves for shifting.
• Transmission Control Module (TCM): Controls shifting, engine/transmission communication, and adaptive learning.
• Fluid Pump: Pressurizes transmission fluid, ensuring proper fluid flow to internal components.
• Solenoids: Control the hydraulic pressure to the clutches, helping control gear shifts.
• Overdrive Clutch: Allows the transmission to shift into higher gears for cruising at lower engine speeds.
• Input Shaft: Connects the engine’s output to the transmission, transferring power into the gearbox.
• Output Shaft: Transfers power from the transmission to the driveshaft.
• Input and Output Bearings: Support and reduce friction on the input and output shafts.
• Oil Cooler: Prevents the transmission from overheating by cooling the fluid.
• Shifter Mechanism: Allows for shifting between gears in the vehicle’s transmission system.

10R140 TorqShift 10-Speed Automatic Transmission (2020-2022)

The 10R140 is a 10-speed automatic transmission that comes with the 2020-2022 Ford F-250 Super Duty trucks equipped with the 7.3L Gas V8 or 6.7L Diesel engines.

Key Parts:

• Torque Converter: A hydraulic device that connects the engine to the transmission and allows smooth power delivery.
• Planetary Gear Sets: Multi-gear setups for efficient shifting and torque transfer.
• Clutch Packs: For the engagement and disengagement of gears within the transmission.
• Bands: Control the rotation of gearsets to engage the right gear at the right time.
• Valve Body: Directs fluid to appropriate areas to control gear shifting, using a series of channels and valves.
• Transmission Control Module (TCM): Oversees shift logic and communicates with other vehicle modules for performance and efficiency.
• Fluid Pump: Circulates transmission fluid, providing necessary hydraulic pressure for clutch and band engagement.
• Solenoids: Electronic valves that control hydraulic pressure and shift operations.
• Overdrive Clutch: Provides smoother, higher-speed driving by engaging overdrive gears.
• Input Shaft: Carries power from the engine into the transmission.
• Output Shaft: Sends power to the vehicle’s drivetrain after passing through the transmission.
• Input and Output Bearings: Provide support for the shafts and reduce friction.
• Oil Cooler: Keeps the transmission fluid at optimal temperatures, reducing the risk of overheating.
• Shifter Mechanism: Works with the TCM to facilitate shifting between gears.

Common Transmission Parts Across Both Models:

• Transmission Fluid: Essential for lubrication, cooling, and smooth shifting.
• Seals and Gaskets: Prevent leaks and ensure the transmission fluid remains contained.
• Electronic Sensors: Monitor various transmission parameters and communicate with the TCM.
• Filters: Keep contaminants out of the fluid system, ensuring proper fluid flow and preventing damage.
• Housing/Case: The outer shell that contains and protects all internal components.

These are the key components that are found in the various transmissions used in the Gen 4 Ford F-250 Super Duty trucks. Each transmission system has similar fundamental parts, but they differ in terms of specific designs, gear configurations, and electronic systems tailored for different engine types and performance needs.

Transmission Maintenance

To keep your Ford F-250 Super Duty transmission running smoothly and avoid costly repairs, regular maintenance is essential. The following are general maintenance recommendations for the transmission, though always check the owner’s manual for your specific year and model for the most accurate guidelines.

Transmission Fluid Changes

• Interval: Typically, it’s recommended to change the transmission fluid every 30,000 to 60,000 miles for most models. However, if you use your truck for heavy towing, off-roading, or other demanding tasks, more frequent fluid changes may be required.
• Fluid Type: Always use the manufacturer-recommended fluid (e.g., Mercon LV or equivalent).
• Fluid Check: Periodically check fluid levels and condition. Healthy fluid should be bright red or amber. If it appears dark or has a burnt smell, it’s time for a change.

Transmission Filter Replacement

• Interval: Replace the transmission filter approximately every 30,000 to 60,000 miles or when changing the fluid. This ensures that dirt and debris don’t clog the fluid passages.

Transmission Cooler Maintenance

• Inspection: If your F-250 is used for towing or heavy loads, check the transmission cooler for any signs of damage, clogs, or leaks. A functioning cooler is vital in preventing overheating.
• Cleaning: Ensure the cooler is free of dirt and debris that may obstruct airflow or fluid flow, especially if you often tow or drive in hot conditions.

Transmission Fluid Leaks

• Inspection: Regularly inspect for signs of transmission fluid leaks under the vehicle. If you spot any puddles, check the seals and gaskets. Leaking fluid should be addressed immediately to prevent damage.
• Common Areas for Leaks: Around the pan, valve body, and cooler lines.

Transmission Flush (Optional)

• Flush vs. Drain: While a fluid change drains the pan and refills it, a transmission flush involves replacing nearly all of the fluid by circulating it through the system, including the cooler and torque converter. Flushing may be recommended when the fluid appears degraded or if there is transmission slippage.
• Frequency: A flush can be done at 60,000 miles or as needed based on fluid condition.

Transmission Temperature Monitoring

• Check Transmission Temperature: Pay attention to the transmission temperature, especially if you’re towing or hauling heavy loads. If the temperature gets too high (above 220°F), you risk damaging the transmission.
• Upgrading the Transmission Cooler: If your truck is frequently used for towing, adding an auxiliary transmission cooler can help keep temperatures in check.

Shift Solenoids and Sensors (Automatic Transmission)

• Inspection: Periodically inspect the shift solenoids and sensors to ensure they’re functioning properly. Faulty solenoids or sensors can cause erratic shifting or poor transmission performance.
• Symptoms of Failure: Harsh shifts, delayed shifting, or error codes from the vehicle’s OBD system can indicate a malfunctioning solenoid or sensor.

Transmission Behavior Monitoring

• Smooth Shifting: Pay attention to any unusual noises (whining, grinding, or clunking), slipping, or delayed shifts. These can be early warning signs of internal transmission problems.
• Torque Converter: If the truck shudders or hesitates when accelerating, it may indicate issues with the torque converter, which could require inspection or replacement.

Towing and Heavy Load Maintenance

• Reduce Stress on Transmission: If you’re towing heavy loads, always ensure your transmission fluid is at the right level and in good condition.
• Consider Auxiliary Cooling: For trucks regularly towing heavy loads, installing an auxiliary transmission cooler can prevent overheating and reduce stress on the transmission.

Transmission Software Updates

• ECU/TCM Updates: Ford may release updates to the vehicle’s transmission control module (TCM) or engine control unit (ECU) to address shifting patterns or fix minor transmission performance issues. Check with your local Ford dealer for software updates.

Parts Prone To Fail

The Gen 4 Ford F-250 Super Duty (produced from 2017 to 2019) features a variety of advanced transmissions, including the 6R140 and TorqShift 10-speed automatic transmissions. While these transmissions are generally reliable, some known maintenance and repair issues have emerged over time. Below is a list of some common issues associated with the Gen 4 F-250 Super Duty transmissions:

6R140 Transmission Issues (2017-2019)

The 6R140 is the 6-speed automatic transmission used in most Super Duty models during the Gen 4 period, paired with the 6.7L Powerstroke Diesel and 6.2L Gasoline engines.

Common Issues:

• Shuddering or Jerky Shifting: Some owners have reported issues with harsh or jerky shifts, especially during low-speed driving or when the truck is under load. This is often due to a failure in the torque converter, shift solenoids, or fluid contamination.
• Delayed Shifting: A delay in shifting from one gear to another is a common issue with the 6R140 transmission. This can be caused by issues in the valve body, solenoids, or transmission control module (TCM).
• Overheating: Overheating is a concern, especially for trucks that are used for towing or heavy-duty applications. If the transmission fluid temperature gets too high, it can cause the fluid to break down, resulting in poor performance and potential damage.
• Transmission Fluid Leaks: Leaks can develop around seals, gaskets, or the transmission cooler lines, which can lead to low fluid levels and subsequent transmission failure if not addressed promptly.

Solutions:

• Transmission Flush: Regularly flushing the transmission fluid (and replacing the filter, if applicable) can help prevent issues with contamination, overheating, and fluid breakdown.
• Torque Converter Replacement: If the transmission shudders, a torque converter replacement may be needed. A faulty torque converter can cause engagement issues, slipping, and shuddering.
• Check for Leaks: Periodically inspect seals and gaskets for leaks and replace them as needed.
• Upgraded Cooler: For vehicles that tow heavy loads, adding an upgraded or auxiliary transmission cooler can help manage the temperature and prevent overheating.

10-Speed TorqShift Transmission Issues

Introduced in 2017 as an option for the 7.3L V8 and 6.7L Powerstroke Diesel engines, the 10-speed TorqShift is a more advanced transmission that is capable of providing better fuel economy and smoother shifting.

Common Issues:

• Hard Shifting or Slipping: Some users have reported issues with harsh or hard shifts, especially between the lower gears. This can be caused by faulty solenoids, shift programming, or issues with the valve body.
• Transmission Control Module (TCM) Issues: The TCM in the 10-speed transmission may experience software-related issues or failure, causing erratic shifting patterns, poor response, or even complete transmission failure. A software update from Ford may help in some cases.
• Hesitation on Acceleration: A noticeable hesitation when accelerating, especially from a stop, has been a reported issue. This can be attributed to clutch pack engagement or the way the transmission’s multiple clutches engage and disengage.
• Torque Converter Lockup Issues: Some owners have experienced issues with the torque converter not locking properly, causing a slip when accelerating or cruising at highway speeds.

Solutions:

• Software Updates: Keep the transmission software updated through the dealer. Ford often releases fixes that help resolve shifting and torque converter lockup problems.
• Shift Solenoid Replacement: If shifting is erratic, faulty solenoids may be the issue. Replacing these can restore smoother shifting.
• Clutch Replacement: If clutch slippage or hesitation on acceleration persists, it may be necessary to inspect and replace the clutches or the torque converter.

Checking Fluid Levels

For the most part, the procedure between the two transmissions is rather similar.  The biggest difference is the difference in transmission fluids used.  Make sure you use the correct fluid when servicing.

Tools and Supplies Needed:

• Vehicle on a level surface
• Safety gear (gloves, glasses)
• 8mm hex or appropriate fill plug tool
• Clean lint-free rag
• Jack and jack stands (if needed)

6R140

1. Warm Up the Transmission

• Start the engine and let it idle.
• Shift through all gears (PRNDM21), pausing for a few seconds in each.
• Return to Park (P) and let the engine idle.
• Transmission fluid must be between 180°F and 200°F for an accurate reading.

You can monitor the transmission temp using a scan tool or the dashboard info screen (if equipped).

2. Locate the Transmission Fluid Level Check Plug

• Crawl under the vehicle with safety precautions.
• Locate the fluid level check plug:
  • It’s on the passenger side of the transmission oil pan, NOT on the side of the case like older designs.
  • You’ll see a small recessed plug about halfway up the pan.

3. Check the Fluid Level

• With the engine idling, remove the check plug.
• Fluid should drip out in a small stream or just a dribble.
  • If fluid pours out: overfilled.
  • If no fluid comes out: under-filled.

Only check with the vehicle running and fluid at operating temp. Otherwise, you’ll get a false reading.

4. Add Fluid if Needed

• The fill plug is on top of the transmission or via a dedicated fill tube (check your model).
• Add fluid in small increments using a pump.
• Reinstall the check plug when fluid begins to lightly drip out.

* Only use Ford Mercon® LV ATF (approved fluid for 6R140)

10R140

This is similar to the 6R140 but here you can use an OBD scanner to monitor transmission temp as well.

Step-by-Step Procedure:

1. Warm Up the Transmission

• Start the truck and let it idle until the transmission fluid reaches 190°F–200°F.
• Cycle through all gears (PRNDM) with a brief pause in each, then leave it in Park.
• Leave the engine running for the rest of the procedure.

Use a scan tool or dashboard readout to monitor trans fluid temperature. This step is crucial for accuracy.

2. Locate the Transmission Fluid Level Check Plug

• The 10R140 transmission uses a unique internal standpipe in the pan.
• Crawl under the vehicle (safely supported) and locate the check/fill plug on the passenger side of the transmission pan.

3. Remove the Check Plug

• With the engine running and fluid at the proper temperature, remove the plug.
• You may see one of three things:
  • Small steady stream or dribble = proper level
  • Nothing comes out = low level
  • Fluid gushes out = overfilled

4. Add Fluid If Necessary

• If fluid does not come out, use a fluid pump to add MERCON® ULV via the same check/fill hole.
• Add in small amounts.
• Once fluid begins to trickle from the hole, stop.
• Let excess drain until it becomes a light drip.
• Reinstall the plug and torque it to spec (~10–12 ft-lbs or per factory spec).

Only use MERCON® ULV. Using the wrong fluid can damage the transmission. Ensure fluid is checked hot and while running. Cold readings will be incorrect. The internal standpipe design means you cannot overfill unless the standpipe is damaged or missing.

Signs You Need Service

Common Warning Signs you need service for both the 6R140 & 10R140.

Delayed or Harsh Shifting

• Symptoms:
  • Hesitation going into gear (especially Reverse or Drive)
  • Rough or abrupt upshifts/downshifts
• Possible Cause: Low or dirty fluid, valve body issues, clutch wear

Slipping Gears

• Symptoms:
  • Engine revs increase but vehicle doesn’t accelerate
  • Sudden drops in speed or “neutral feeling” while driving
• Possible Cause: Worn clutches, low fluid, internal damage

Shuddering or Vibration

• Symptoms:
  • Shaking during acceleration, especially around 30–50 mph
  • Feels like driving over rumble strips
• Possible Cause: Torque converter issues, fluid breakdown, or transmission tuning problems

Fluid Leaks

• Symptoms:
  • Reddish or dark brown fluid spots under the truck
• Possible Cause: Pan gasket, seals, or cooler line leaks

Burning Smell

• Symptoms:
  • Hot, acrid odor—especially after towing or hill driving
• Possible Cause: Overheated or burnt fluid, clutch damage

Check Engine Light / Transmission Warning Light

• Symptoms:
  • Light may be steady or flashing
  • May include specific codes (e.g., P07XX, P17XX)
• Possible Cause: Electronic sensor faults, solenoid failures, internal slip detection

Downshifting Hesitation or Clunking

• More common on the 10R140, especially in earlier software versions (2020–2021)
• Possible Cause: Calibration issue, may be fixable with a TCM software update

Overheating

• Symptoms:
  • Transmission temperature warning on the dash
  • Fan running loudly or erratically
• Possible Cause: Towing over GVWR, blocked cooler, fluid breakdown

Replacement Costs

The replacement costs for a Gen 4 Ford F-250 Super Duty transmission can vary depending on the specific transmission type, whether you opt for a new, remanufactured, or used transmission, and labor costs in your area. Here’s an estimate based on the three primary transmission types found in the Gen 4 F-250 Super Duty trucks:

6R140 Automatic Transmission (2017-2019)

• New Transmission: $3,500 – $5,000
• Remanufactured Transmission: $2,500 – $4,000
• Used Transmission: $1,500 – $3,000
• Labor Costs: $1,000 – $1,500

Total Estimated Replacement Cost:

• New: $4,500 – $6,500
• Remanufactured: $3,500 – $5,500
• Used: $2,500 – $4,500

10R140 10-Speed TorqShift Automatic Transmission (2017 and Newer)

• New Transmission: $4,500 – $6,000
• Remanufactured Transmission: $3,500 – $5,500
• Used Transmission: $2,500 – $4,500
• Labor Costs: $1,200 – $1,800

Total Estimated Replacement Cost:

• New: $5,700 – $7,800
• Remanufactured: $4,700 – $6,800
• Used: $3,700 – $6,300

Factors Influencing Cost:

1. Transmission Type: Automatic transmissions (especially the newer 10-speed TorqShift) tend to cost more due to complexity and higher demand.
2. New vs. Remanufactured vs. Used: New transmissions are the most expensive but come with the full warranty. Remanufactured transmissions offer a middle ground between price and reliability, while used transmissions may be cheaper but come with a higher risk of defects.
3. Labor Costs: Labor costs can vary significantly depending on your location and the repair shop’s rates. Some transmission replacements require a significant amount of labor, particularly for automatic transmissions that are more complex.
4. Warranty: A new transmission typically comes with a manufacturer’s warranty, while remanufactured and used parts may have shorter warranties or none at all.

Conclusion:

• Expect to pay between $5,000 and $7,800 for a full transmission replacement in your Gen 4 F-250 Super Duty, depending on the transmission type and whether you choose a new, remanufactured, or used transmission. The labor costs will add an additional $1,000 to $1,800.