Motive Gear Differential Ring & Pinion MGK-209 Rebuild Kit For GM 8.5"/GM 8.875" Truck Front & Rear Ratio 4.11, 10/12-Bolt 30 Spline 10F & 9R Pinion 41F & 37R Ring Tooth FitsChevy/GMC K-Series

More about this item : Motive Gear Differential Ring & Pinion MGK-209 Rebuild Kit For GM 8.5"/GM 8.875" Truck Front & Rear Ratio 4.11, 10/12-Bolt 30 Spline 10F & 9R Pinion 41F & 37R Ring Tooth FitsChevy/GMC K-Series

Short Summary: Upgrade your classic GM 4x4 drivetrain with the Motive Gear MGK-209 gear package 4.11.

Designed for GM 8.5" front and 8.875" rear axles, this set includes front and rear ring & pinions plus Timken bearing kits for a reliable refresh on 1977–1982 K-series trucks.

Key Features Axle Fitment: GM 8.5" Front / GM 8.875" Truck Rear Gear Ratio: 4.11 Spline Count: 30 Pinion Teeth: 10 Front / 9 Rear Ring Gear Teeth: 41 Front / 37 Rear Pinion Shaft Diameter: 1.626" Front / 1.438" Rear Ring Gear Diameter: 8.5" Front / 8.875" Rear Bolt Count: 10-Bolt Front / 12-Bolt Rear Material: 8620 Steel Includes: Front & Rear Ring and Pinion Sets with Timken Installation Kits Vehicle Compatibility 1977–1981 Chevrolet K10 1977–1982 Chevrolet K10 Suburban 1977–1981 Chevrolet K20 1977–1981 Chevrolet K20 Suburban 1977–1981 Chevrolet K5 Blazer 1977–1978 GMC K15 Suburban 1979–1982 GMC K1500 1979–1982 GMC K1500 Suburban Replaces OEM & Aftermarket Part Numbers GM Thick Gear Sets for GM 8.5" Front & GM 8.875" Rear Axles Warranty & Quality Assurance Backed by a 1-Year / 50,000-Mile Warranty.

Motive Gear delivers superior materials, accurate machining, and rigorous testing for unmatched reliability and quiet performance in heavy-duty truck use.