2021 Ford F-150 Transmission & Axle Gear Ratios
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Transmission gear ratios
The 2021 Ford F-150 was available with a single transmission option, the 10-speed 10R80 automatic.
| Gear | Ratio |
|---|---|
| 1 | 4.69 |
| 2 | 2.98 |
| 3 | 2.14 |
| 4 | 1.76 |
| 5 | 1.52 |
| 6 | 1.27 |
| 7 | 1.00 |
| 8 | 0.85 |
| 9 | 0.68 |
| 10 | 0.63 |
| Rev | -4.86 |
Available axle ratios
| Ratio | Available With (engine/trim/package) | Axle Code | Best For |
|---|---|---|---|
| 3.31 | Standard on most models | Not specified | Fuel economy |
| 3.55 | Optional on most models | Not specified | Balanced |
| 3.73 | 3.5L EcoBoost, Max Trailer Tow Package | Not specified | Towing |
| 4.10 | Tremor Package | Not specified | Towing/Off-road |
How to identify your axle ratio
There are a few ways to identify your 2021 Ford F-150's axle ratio. The easiest is to check the door-jamb sticker. On the driver's side door jamb, you will find a sticker that lists various information about your truck, including the axle code. The axle code is a two-digit code that corresponds to a specific axle ratio. You can use a VIN decoder to find out your truck's axle ratio. The VIN is a 17-digit code that is unique to your vehicle. You can find the VIN on the driver's side of the dashboard, near the windshield. Finally, you can check the axle tag. The axle tag is a metal tag that is bolted to the axle housing. The axle tag will have the axle ratio stamped on it.
Towing vs MPG impact
A numerically lower axle ratio (e.g., 3.31) will result in better fuel economy, while a numerically higher axle ratio (e.g., 4.10) will result in better towing performance. This is because a higher axle ratio provides more torque to the wheels, which is necessary for towing heavy loads. However, a higher axle ratio also causes the engine to run at a higher RPM, which reduces fuel economy.
Common issues
Some common issues with the 2021 Ford F-150's driveline include ring and pinion whine, carrier bearing failure, and limited-slip clutch wear. Ring and pinion whine is a high-pitched noise that is most noticeable when the vehicle is accelerating or decelerating. Carrier bearing failure can cause a variety of problems, including a grinding noise, a vibration, and a loss of power. Limited-slip clutch wear can cause the vehicle to lose traction in slippery conditions.
Find a driveline shop on Repairius.
More specs for the 2021 Ford F-150
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 Ford F-150 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-09-02.