For the GM folks looking to upgrade their rear end traction, this Eaton Posi Limited Slip Differential is a serious piece of hardware. It's designed for GM 8.5-inch (aka 10-bolt) rear axles and uses a 30-spline configuration. What does it do? Basically, it helps send power to both rear wheels more evenly, reducing wheel spin when you accelerate – especially useful in corners or on slick surfaces. It's built tough with precision-forged gears and uses carbon friction technology for smooth operation. Important note: this unit requires special bearings depending on your axle's bearing bore size (2.89\ OD needs LM-102949/LM-102911; 3.06\ OD needs LM603049/LM603012). Make sure you check your setup before ordering. Fits various Buick and Oldsmobile wagons, Roadmasters, and similar GM vehicles from the late '80s to mid-'90s with the 8.5 rear. Not a small job to install, but if you're tired of one-wheel peel, this Eaton unit will transform how your car puts down power. Solid, rebuildable, and a classic performance upgrade.
