Powertrax GT109028 Grip Pro Traction System Fits select: 1966-1978 FORD MUSTANG, 1975-1986 FORD F150

Powertrax Grip Pro Traction Systems are the latest design in traction using 3 x 2 spiral gear technology for smooth, dependable operation that combines a limited-slip differential with the strength of a fully machined, forged steel case. Because there are no friction plates, no friction modifier additive is necessary.  Always use a 80W-90 weight petroleum based gear oil with a GL-5 (or higher) rating, friction additive/modifiers should NOT BE USED.  Synthetic oils and oils containing friction modifiers are not recommended.  Powertrax Grip Pro differentials are the ideal solution for just about any light truck, sport utility, and muscle car on the road today. Whether you need the safety of added traction for daily commuting, recreation, work, or just so your muscle car puts power to the pavement instead of burning one wheel up, Powertrax Grip Pro limited slip differentials are your answer. Features: Latest Posi-Trac Design. Uses 3 x 2 Spiral Gear Technology. Comes Fully Assembled. Delivers Progressive & Variable Traction. Allows You to Control How Much Traction is Applied. Housed in a Fully Machined, Forged Steel Case. Fits 28 spline axles for 9 inch Ford w/ 1.781" side carrier bearings. Our rebuild kit for 1.781" carrier bearing cases is 9190950-31.