GM 10-Bolt 8.5 8.6 Inch 3.42-4.88 Ratio Face Hobbed Ring Pinion Revolution Gear and Axle Lighting - Wiring & Controllers - Relays Naturally Aspirated HP at 8PSI:

Naturally Aspirated HP at 8PSI: 850

Bed Length Metric: 156

GMC C15 1978-1975

RTL-B: Solid amber lights and a blue center light

A wiring harness for each application is sold separately

GM 10-Bolt 8.5 8.6 Inch 3.42-4.88 Ratio Face Hobbed Ring Pinion Revolution Gear and Axle Lighting - Wiring & Controllers - Relays Naturally Aspirated HP at 8PSI:Revolution Gear and Axle ring and pinion manufactured to be compatible with GM 8. 5 Inch GM 8. 6 Inch differentials. GM 10 Bolt ring and pinions are manufactured with the same gear cutting processes as the OE brands, utilizing a Face Hobbed or 2 Cut gear cutting style followed by lapping. Face hobbed gears can be easily distinguished by the equal gear height from heel to toe. Face hobbed gears produce lower noise and increase load carrying capacity