GM 10-Bolt 8.5 8.6 Inch 3.42-4.88 Ratio Face Hobbed Ring Pinion Revolution Gear and Axle Variant:and 8.6 Inch 4.88 Ratio Face Hobbed Ring and Pinion Revolution Gear 38 Ratio is a thick

38 Ratio is a thick gear for fitment with 4

1988-1999 GMC C1500 Fleetside 78

Contours the Spidertrax differential for a precise fit and ultimate rigidity

Fits 3 inch axle diameter

Factory dually wheels cannot be reinstalled

GM 10-Bolt 8.5 8.6 Inch 3.42-4.88 Ratio Face Hobbed Ring Pinion Revolution Gear and Axle Variant:and 8.6 Inch 4.88 Ratio Face Hobbed Ring and Pinion Revolution Gear 38 Ratio is a thickRevolution 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