Complete Kit GM 8.5in w/ Eaton / Auburn Posi

The Complete Kit GM 8.5in w/ Eaton / Auburn Posi is a professional-grade differential installation kit engineered for GM 10-bolt rear axle assemblies. Designed for technicians, shop mechanics, and serious DIY enthusiasts who demand reliability in heavy-duty drivetrain work, this RATECH kit eliminates guesswork and sourcing delays by bundling all critical components into one verified package. Whether you're rebuilding a worn differential, upgrading to Posi traction, or restoring a classic truck platform, this complete solution ensures proper assembly the first time.

This kit includes precision-matched bearings, crush sleeve, quality gaskets, fastener hardware, seals, shims, and marking compound—every consumable and wear item needed for a factory-correct rebuild. The Eaton Auburn Posi differential provides superior traction by mechanically locking both wheels under load while permitting differential action in turns, a critical upgrade for off-road, towing, or performance applications. RATECH's engineering ensures proper preload geometry, backlash specification, and bearing fit; the included marking compound allows verification of gear tooth contact during setup, preventing premature failure and noise. At 5.55 lbs, the complete assembly ships ready for use without additional sourcing.

Ideal for fleet maintenance shops, restoration facilities, and serious truck owners, this kit fits GM 10-bolt differentials common in Chevrolet, GMC, and performance platforms from the 1970s onward. Installation requires standard axle work experience and proper tools; compatibility with 8.5-inch housing is absolute. Buy the Complete Kit GM 8.5in w/ Eaton / Auburn Posi for guaranteed component compatibility, reduced downtime, and the confidence of a professional rebuild solution. Review detailed torque and assembly specs in the technical documentation before beginning work.