1970-96 GM 10 Bolt 8 1/2 Inch Ring and Pinion, 8.5 R&P
GM 8.5" 10-Bolt, 1.63" Shaft Diameter, 8.50" Outside Diameter, 30 Spline Count
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Many 8.5 Inch ring and pinion ratios to choose from.
- 8.50" diameter ring gear
- 1.625" diameter pinion
- For rear axle application that uses 10 ring gear bolts & 10 cover bolts
- 30 pinion splines
- Uses LH thread ring gear bolts - 7/16"-20
- 8.5 R&P
Note: When replacing a stock 2.56 (or numerically lower) ratio 8.5 Inch Ring and Pinion, the carrier must also be replaced with a 2.73 or higher ratio's carrier to compensate for the difference in ring gear thickness.
- Buick Full Size 1977-1996
- Buick Electra 1976-1978
- Regal 1973-1977
- Century 1973-1977
- Skylark, GS 1971-1975
- Skylark, GS 1977-1979
- Chevy Full Size Car 1971-1996
- Chevy II 1971-1979
- Nova 1971-1979
- Camaro 1971-1981
- Firebird TA 1971-1981
- Cutlass 1971-1977
- El Camino 1971-1977
- Monte Carlo 1971-1977
- Impala 1991-1996
- Olds Full Size 1971-1989
- Pontiac Full Size 1971-1989
- Grand Prix 1971-1977
- Lemans 1971-1977
- GTO 1971-1977
- Ventura 1971-1977
WarrantiesNote: Circle track racing applications require a minimum of 4 qts. of rear end lube. Using less than this amount will lead to immediate pinion bearing failure.
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Q & A
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Finally, Project Chevelle gets a real hot rod engine under its hood! And what about that flimsy old column shift three-speed? We've got that covered too.
Speedway Motors employees are committed to helping customers, as well as working on their own projects during down time. Follow along as our employee, Zach, rebuilds a 10 Bolt.
How to determine the quick change R&P ratio without opening up the rear in street cars with quick changes, sprint cars, modifieds, late models and GOTRA cars.
Lucas P. explains how to choose the correct part for a Ford 9" third member build in order to achieve a bulletproof rear. You will find specific recommended parts to use from Speedway Motors.
Diagrams showing the proper measuring techniques for axles and identification diagrams for the various 9-Inch housings.
Steve provides a step-by-step guide to install the Speedway Motors GM 10-Bolt Polished Finned Aluminum Rear End Cover.