Eaton Posi Differential 30 Spline 1.29in Axle Shaft Diameter 3.08-3.90 Ratio Rear 8.875in

If you're looking to improve traction and control for your street rod, light truck, or even a tarmac-running race car, the Eaton Posi limited-slip differential is a solid choice. This unit is designed to automatically manage power distribution to your rear wheels, preventing wheel slip and ensuring you get the most grip possible, especially when accelerating out of corners or on less-than-perfect surfaces. It's a significant upgrade over an open differential, giving you more confidence and better performance.

What sets this Posi differential apart is its use of pyrolytic carbon clutch discs. This advanced material offers smooth, automatic engagement that you can rely on, without the harshness sometimes found in other designs. The gears inside are precision-forged, meaning they're built for added strength and durability to handle the demands of spirited driving or racing. Plus, the entire unit is designed to be rebuildable, so you can refresh it down the road if needed, extending its service life. It's also tunable through various spring packs, allowing you to adjust the pre-load to fine-tune its performance to your specific setup.

This differential is built for 30-spline axle shafts and works with ring and pinion gear ratios from 3.08 up to 3.90 within an 8.875-inch axle housing. It fits a wide range of classic American vehicles, including models like the 1964-1972 Buick Skylark, 1967-1972 Chevrolet Camaro, and 1964-1971 Oldsmobile 442, among many others. Installation will involve setting up the differential within your rear axle housing, which typically requires specialized tools and knowledge of gear setup. Refer to the manufacturer's installation instructions for detailed procedures and any specific hardware or setup requirements.