Description
Yukon Gear & Axle(R) provides the highest quality aftermarket drivetrain parts in the industry. Yukon products are produced using superior materials and built to tolerances that exceed OE specifications. We do drivetrain right! Yukon manufactures high performance ring and pinions, positractions, lockers, axle upgrades, rebuild kits, hubs, driveshafts, diff covers, and more. Proven at King of the Hammers and the granite crags of Moab, Yukon products are built for abuse so enthusiasts can gear up and wheel with confidence.
This kit dramatically improves traction and durability by adding a Yukon Dura Grip LSD and an upgraded ring and pinion set to your diff. It’s also an opportunity to generate next-level acceleration by moving to a more aggressive gear ratio.
8.5″ GM 3.90 REAR R&P GEAR/ INSTALL KIT PACKAGE with 28spl POSI & AK 1563 AXLE BRGS (2.25″ OD)
- Coverage includes ’70 to ’81 Firebird Trans Am, ’70 to ’77 GTO, 25 other models, or anything hot-rodded with a GM 8.5” diff
- Coverage Incl. 70 To 81 Firebird Trans Am; 70 To 77 GTO; 25 Other Models; Or Anything Hot-Rodded w/A GM 8.5 in. Diff
- Includes positraction unit, ring and pinion gear set, and all required bearings and installation hardware
- Incl. Positraction Unit; Ring And Pinion Gear Set; And All Required Bearings And Installation Hardware
- Includes Dura Grip positraction LSD, 28 spline
- Incl. Dura Grip Positraction LSD; 28 Spline
- Fits GM 8.5 in. differential
- Fits GM 8.5” differential
- 30 spline pinion gear
- 2.25 in. OD Bearings
- 10 bolt ring gear
- 2.25″ OD bearings
- 3.90 ratio
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