Eaton 914A538 Detroit Truetrac LSD for GM 9.5" 14-Bolt Rear 33-Spline All Ratios

Regular price: $813.99
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Product Specification:

SKU:EAT914A538

MPN: 914A538

Weight: 44.9 lb

Type: Differentials

Vehicle Fitment

1981-2012 GM Trucks (C/K, Silverado, Sierra) with GM 9.5" 14-Bolt Rear Axle (33-Spline, 1.37" axle shafts)
1999-2021 Chevrolet Silverado / GMC Sierra 1500 with OEM 9.5" 14-Bolt Rear Axle
Other GM full-size pickups and vans using the 9.5" 14-Bolt Rear Differential housing (33 splines)

Fitment Notes

Rear axle must be GM 9.5-inch 14-Bolt; not for non-14-Bolt or smaller axle housings.
Spline count must be 33 and axle shaft diameter ~1.37 in.
Gear ratio can be any; this Truetrac fits all ratios on this axle.
Ensure ring gear cover bolt pattern, carrier bearing fitment, and axle housing width are correct.

Features

Helical-gear limited-slip design for smooth, automatic torque distribution.
No wearing clutches or friction plates - maintenance-free operation.
Quiet, dependable performance on both streets and light off-road use.
Compatible with all gear ratios in the GM 9.5" 14-Bolt housing.
Robust 33-spline internal gears for strength under load.
Steel construction for long life and resistance to heat & stress.
Enhanced traction control for towing, hauling, or slippery conditions.
OEM style bolt pattern eliminating major housing modifications.

Specifications

Ring gear size: 9.5" (GM 14-Bolt rear)
Spline count: 33
Axle shaft diameter: ≈ 1.37 in
All gear ratios supported
Differential type: Limited Slip (Helical LSD)
Position: Rear axle only
Weight: ~33.76 lb

Included Components

1x Eaton Detroit Truetrac Differential unit (part # 914A538)
Installation instructions
Warranty paperwork

Product Description

The **Eaton 914A538 Detroit Truetrac** is a premium limited-slip differential designed specifically for GM's 9.5-inch 14-Bolt rear axle (C-clip style). With 33-spline axle shafts and a ~1.37-in shaft diameter, it supports *all gear ratios* while providing improved traction, less wheel spin, and quieter, smoother operation compared to open differentials. Whether for hauling, towing, street driving, or occasional off-road, this Truetrac delivers robust performance without needing clutches, friction modifiers, or frequent maintenance.

Fitment is confirmed for GM trucks and SUVs from ~1981-2012 (Silverado, Sierra, C/K series, etc.) using the 9.5" 14-Bolt rear housing. Before purchase, verify your axle has the correct ring gear size (9.5"), 14-bolt cover, 33 splines, and proper axle shaft diameter. Installation is straightforward for experienced mechanics; torque and bolt patterns should match factory specs.

If you need a match for front or non-standard axle widths, or want to confirm fitment on your specific year/model/trim, I can cross-check deeper.