USA Standard Gear ZGK2002 GM 8.5" Rear 3.73 Ring & Pinion Install Kit with 30 Spline Posi

The USA Standard Gear ZGK2002 is a comprehensive differential upgrade package designed for GM 8.5-inch rear axles. This complete Quick Kit combines a 3.73 ratio ring and pinion gear set, master install kit, Yukon Dura Grip limited slip positraction, and axle bearings and seals in one convenient part number—providing everything needed for a complete differential rebuild.

Complete Kit Includes:

• USA Standard 3.73 ratio ring and pinion gear set for 8.5-inch GM applications
• Master install kit with high-quality Koyo bearings and all necessary small parts
• Yukon Dura Grip 30-spline clutch-style limited slip differential (fully rebuildable)
• Axle bearings and seals for complete axle service
• Differential carrier bearings with 2.891-inch outside diameter

Application Details:

• Designed for GM 8.5-inch rear differentials with 10-bolt rear cover and 10-bolt ring gear
• 3.73:1 gear ratio provides improved acceleration and torque multiplication
• 30-spline Dura Grip posi unit features high-strength nodular case and forged 4320 chromoly spider gears

USA Standard Quick Kits streamline differential repairs by bundling all necessary components into a single part number, reducing installation time and ensuring compatibility. The Yukon Dura Grip limited slip delivers smooth yet aggressive traction across varied terrain, while the Koyo bearings ensure long-lasting durability. Each gear set undergoes rigorous in-house quality testing for dimensional accuracy, material quality, and proper fitment.