10R80 vs 10R140
What's the Difference?

Ford runs two 10-speed automatics with confusingly similar names. The 10R80 is the half-ton and car unit: F-150, Mustang, Expedition, Ranger. The 10R140 is the Super Duty unit: F-250 through F-600, behind the 6.7L Power Stroke diesel and the 7.3L "Godzilla" gas V8. They share the 10-speed concept and a naming convention, but they are not the same transmission, they do not share major parts, and they do not take the same fluid.

The number in the name is the giveaway. Ford's modern naming is [number of gears]R[torque capacity code]. So 10R80 is a 10-speed rated in the 800-Nm class; 10R140 is a 10-speed rated in the 1,400-Nm class. That torque-capacity gap of nearly double is the entire story of why these are different boxes.

Side-by-Side Spec Comparison

The headline: the 10R140 is a physically larger, heavier, higher-capacity gearbox with a bigger case, more robust internals, a larger cooling circuit, and roughly double the rated input torque of the 10R80. It has to be, because it lives behind a 6.7L Power Stroke making well over 1,000 lb-ft.

Which Trucks Get Which

10R80 Applications

• 2017+ F-150 with the 3.5L EcoBoost, 2.7L EcoBoost, 5.0L Coyote, and 3.0L Power Stroke diesel.
• 2018+ Mustang GT and EcoBoost (the 10-speed replaced the 6R80 there).
• 2018+ Expedition / Lincoln Navigator (3.5L EcoBoost).
• 2019+ Ranger (2.3L EcoBoost) and 2021+ Bronco (2.7L).
• Its close cousin, the 10L80/10L90, is the GM version from the shared program, used in the Silverado, Camaro ZL1, and Escalade.

10R140 Applications

• 2020+ Super Duty F-250 and F-350 with the 7.3L "Godzilla" gas V8 and the 6.7L Power Stroke diesel.
• 2020+ F-450, F-550 chassis cab and pickup.
• F-600 and medium-duty variants where Ford needed a 10-speed rated for the diesel's torque.

The simple rule: if it is a half-ton, a car, or a midsize, it has the 10R80. If it is a Super Duty three-quarter-ton or bigger, it has the 10R140. Ford did not put the 10R80 in the Super Duty diesel because it would not survive the torque, and it did not put the heavier, thirstier 10R140 in the F-150 because it does not need it.

Fluid: Mercon ULV vs Mercon LV (Do Not Mix Them Up)

This is the most common way people damage one of these transmissions, and it is worth being blunt about.

The 10R80 uses Mercon ULV (Ultra Low Viscosity), Ford part XT-12-QULV. It is a thinner fluid chosen for fuel-economy reasons in the lighter trucks and cars. The 10R140 uses Mercon LV (Low Viscosity), Ford part XT-10-QLV, a slightly heavier fluid appropriate for the heavy-duty box's higher loads and pressures.

They are not interchangeable. Putting Mercon LV in a 10R80 or Mercon ULV in a 10R140 changes line pressures, clutch apply feel, and cooling behavior, and can cause harsh or delayed shifts and long-term clutch and pump wear. When you buy fluid, match the exact spec to the exact transmission. Do not "round up" to the heavier fluid thinking thicker is safer; the 10R80 was calibrated around ULV.

Check Mercon ULV (10R80)

Check Mercon LV (10R140)

Both boxes are sealed, fill-from-the-bottom units with no dipstick. Level is set by fluid temperature at the check port, so a fluid change is a temperature-controlled procedure, not a "pour until it runs out" job.

Size, Weight, and Why It Matters for Swaps

The 10R140 is the bigger box in every dimension: longer case, heavier, larger fluid volume, bigger cooler lines. That matters if you are ever tempted by a swap. You cannot drop a 10R140 into an F-150 chassis without major fabrication (crossmember, tunnel, driveline, cooling, and controls), and there is no reason to; the 10R80 already handles half-ton duty. Conversely, the 10R80 is not a candidate behind a 6.7L Power Stroke because the torque would grenade it.

For rebuilders and parts buyers, the practical takeaway is that these two transmissions share almost no hard parts. Clutch packs, drums, the valve body, the pump, and the case are all specific to each. Order 10R80 parts for the 10R80 and 10R140 parts for the 10R140; the naming similarity does not translate to interchangeable components.

Rebuild Cost Ballpark

Costs vary by region, core condition, and whether you are doing a soft-parts refresh or a full rebuild with upgraded clutches, but here are realistic 2026 ranges to set expectations.

The 10R140 costs more across the board because it is a larger unit with more expensive parts, more fluid, and heavier labor. The 10R80 is the more common and cheaper rebuild simply because there are far more of them on the road and the aftermarket support is deeper. Both benefit hugely from an added transmission cooler and a real fluid-change interval; the leading cause of premature failure on both is cooked fluid from towing heat.

FAQ

Are the 10R80 and 10R140 made by the same company?

Both are Ford transmissions. The 10R80 came out of the Ford-GM joint 10-speed program (GM's version is the 10L80). The 10R140 is a Ford-specific heavy-duty design that did not share the GM co-development; it was engineered to handle Super Duty diesel torque.

Can I use Mercon LV in my F-150's 10R80 if I can't find ULV?

No. The 10R80 is calibrated for Mercon ULV. The heavier LV fluid changes shift feel and pressures and can cause harsh shifts and long-term wear. Use the correct XT-12-QULV fluid. If you cannot find it locally, order it rather than substituting.

Which is more reliable?

Both are solid when serviced. The 10R80 had some early-production shift-quality and torque-converter shudder complaints that Ford addressed with updated fluid and calibration. The 10R140 is a heavier-built unit for harder work. On either, the number-one killer is heat from towing without adequate cooling, so an aux cooler and regular fluid changes matter more than which model you have.

Do they share any parts?

Effectively no major hard parts. Despite the similar names, the case, clutches, drums, pump, and valve body are specific to each transmission. Order parts by the exact model.