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8.5", 8620, 3 Series
8620 Street Gears, '70 - '76 Chevelle & Olds F85, '70 - '75 Chevy II, '70 - '81 Camaro/Firebird/GTO | 1.625" diameter pinion stem, 30 spline pinion | 3 Series Carrier, 2.73 and numerically higher, or MW spool.Uses install kit P/N 83-1021 for posi / open carrier applications. Uses install kit 83-1021-S for applications with a spool