Eaton Posi Differential 30 Spline 1.29in Axle Shaft Diameter 4.10 & Up Ratio Rear 8.875in

When you're looking to get the most out of your drivetrain, this Eaton Posi limited-slip differential is a solid choice. It's designed to give you better control over traction, whether you're building a street rod, working on a light-duty pickup, or setting up a tarmac-running race car. This unit replaces your open differential to help prevent wheel slip, especially when you need it most.

Inside, you'll find pyrolytic carbon clutch discs, which are known for their smooth and automatic engagement. This means the differential works seamlessly without you having to think about it. The gears are precision-forged, adding extra strength to handle the demands of spirited driving. Plus, the whole unit is designed to be rebuildable, so you can service it down the road if needed. You can also tune its operation using various spring packs to adjust pre-loads, giving you a bit more control over how it behaves.

This differential is built for rear axles with an 8.875-inch ring gear diameter and accepts 30-spline axle shafts with a 1.29-inch diameter. It's intended for use with gear ratios of 4.10 and numerically lower (e.g., 4.10, 4.56, 5.13). It fits a wide range of vehicles from the mid-60s to early-70s, including models like the Chevrolet Chevelle, Buick Skylark, and Oldsmobile 442.