Eaton 913A477 Detroit Truetrac Limited Slip for 1997-2025 Ford F-150 /Expedition

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Product Specification:

SKU:EAT913A477

MPN: 913A477

Weight: 39.9 lb

Inventory: 14

Type: Differentials

Vehicle Fitment

1997-2025 Ford F-150 (RWD / 4WD / AWD, 4.2L V6 / 4.6L V8 / 5.0L V8 / 3.5L V6 / 2.7L V6 / other factory engines depending on config)
1997-2025 Ford Expedition (RWD / 4WD, 4.6L V8 / 5.4L V8 / 3.5L V6 etc.)
1997-2025 Ford E-Series / Econoline / E-150 / E-250 / E-350 (rear axle models with Ford 9.75", 34-spline configuration)
2015-2025 Ford Transit 150 / 250 / 350 with 9.75" rear axle (34-spline) where factory used

Fitment Notes

Only fits rear axles with Ford 9.75-inch ring gear, **34-spline** axle shafts.
Axle shaft diameter ~1.37-inch.
All gear ratios supported ("All Ratios") in the Ford 9.75" rear.
Verify your vehicle's rear differential; some Transits or E-Series may have different rear ends in certain years. If unsure, remove cover and inspect ring gear size and spline count.
2025 fitment is **unconfirmed** by primary Eaton data; confirmed through 2019 officially for many models.

Features

Helical-gear limited slip differential (Truetrac design) - smooth, quiet, and automatic torque biasing.
Works in forward and reverse seamlessly.
Maintenance-free internals; no wearable clutches or need for friction modifiers.
Steel carrier built for strength; suitable for heavy loads, towing, off-road use.
Valid for many "all ratios" gear setups; no ratio limitation.
Ideal upgrade from open or weaker limited slip diff - improves traction under load or low traction conditions.
Strong axle durability: 34 splines, 1.37-inch shaft diameter.
Broad vehicle application covering trucks, vans, SUVs using Ford 9.75" axle.

Specifications

Part Number: **913A477** (Eaton Detroit Truetrac)
Ring Gear Size: 9.75 inches
Spline Count: **34 splines**
Axle Shaft Diameter: ~ **1.370 inches** (~34.8 mm)
Gear Ratios: All supported (factory range for 9.75" in application)
Axle Location: Rear differential
Weight: ~37 lb (carrier unit)
Type: Limited Slip Differential (LSD) - helical gear (Truetrac)

Included Components

1x Eaton Detroit Truetrac carrier assembly (complete with helical-gear internals)
Note: Differential cover, gasket/seal, ring & pinion bolts generally **not included** (verify with vendor)

Product Description

The Eaton Truetrac 913A477 is a premium helical-gear limited slip differential designed for Ford's 9.75-inch rear axle with 34-spline shafts. Built to deliver superior traction without the drawbacks of clutch-type limited slips, it automatically biases torque toward the wheel with more grip under load, while remaining quiet and smooth during regular driving. It's ideal for trucks, SUVs, and vans that see both on-road and off-road usage, towing, or need improved performance in slippery conditions.

While Eaton officially lists fitment through 2019 in many application charts, vendor data and fitment guides extend support to 2025 for many Ford models using the 9.75" rear axle with 34 splines. For example, many F-150s, Expeditions, and E-Series / Transit vehicles are likely compatible if the axle matches. Confirm your vehicle's rear end ring gear size, spline count, and axle shaft diameter before purchasing. Installation involves unbolting the existing carrier, installing the Truetrac carrier, torquing to OE specs, verifying gear ratio, setting backlash and preload, and using proper GL-5 gear oil; no special lubrication or friction modifiers are required.