Richmond Gear is the leading manufacturer of professional-quality, high performance ring and pinion sets. The superior quality of these gear sets is the result of years of racing development, outstanding design, and state-of-the-art manufacturing methods.
New Clutch type posi differential provides aggressive yet smooth traction, perfect for street and performance applications. These units are fully rebuildable and use Eaton type internal components. We recommend using standard 80/90wt (non-synthetic) oil with posi additive.
4 Spring Clutch type Posi LSD
Nodular Iron Case
4320 Forged Steel Internal Gears
Assembled in the USA
Master Install Kit
Premium master install kit uses only the highest quality components including Timken brand bearings. Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush collar, threadlock, marking compound, brush, and gasket or RTV silicone.
Application: 1968-1972 Oldsmobile "O" Axle Rearend
1968-1972 Olds Cutlass
1968-1972 Olds 442
Cover bolts: 12
Ring Gear Bolts: 10
Axle splines: 28 (must verify before ordering)
Pinion Splines: 27
1- GM 8.5" Olds 3.90 Ring & Pinion Set
1- GM 8.5" Olds Posi LSD (28 Spline)
1- GM 8.5" Olds Master Install Kit