Drivetrain› Differentials and Rear-End Components

Eaton /

Truetrac Limited-Slip Differential

$765.00

SKU: GM85-TTGBK

In Stock
In Stock
Ships by Jul 29
Free Shipping
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

The Eaton Detroit Truetrac is a limited-slip differential designed for GM 8.5" and 8.6" axles. It features a helical gear design for smooth, automatic operation and maximizes wheel traction. This differential is compatible with ring gear ratios of 2.73 and up and has 30 spline gear teeth. It is suitable for various on-road and off-road vehicle uses, including street, drag racing, circle track, and extreme off-road applications.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandEaton /
Part NumberGM85-TTGBK
CategoryDrivetrain

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy