8620 Street, 4 Series
GM 12 BOLT CARRIER NOTES
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| WHICH SERIES CARRIER? | "A" | Car | Truck | 2 Series | .590" | NA | 3 Series | 1.020" | .895" | 4 Series | 1.325" | 1.145" |
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Check the distance from the bearing shoulder to ring gear flange ("A") to determine the carrier series for proper ring & pinion selection. |
8620 Street Gears, '64 - '82 C10/K10 & K20, Blazer, G10/G20 Van | 1.437" diameter pinion stem, 30 spline pinion, 4 Series (Original Carries with 3.73 ratio and numerically higher). These Gears are manufactured from 8620 alloy and used primarily for street, oval track, and lightweight drag racing applications. Gears are designed to provide excellent service life, but are suceptible to high shock loads. Uses install kit P/N 83-1018.