GM 8.5 Inches & 8.6 Inches Ring Gear Differential Cover HRCGM85BK for Chevrolet 1500 2WD 4WDR eplace Part Number: HRCGM85BKF eature:Bolt Pattern: 10 Bolt Material: High Grade Die Cast Aluminum Large Vertical Fins (Great for heat dissipation)Kit Includes Gasket and Mounting Hardware Machined Gasket Flange for a Perfect Seal Will NOT work for 2007 and newer 8.6" differentials that require a fill in hole in the cover, these require M8 x1.25 Metric bolts The Stabilizer bar and sway bar may interfere and not clear on some of the models below髢?Especially 2005 Chevy Tahoe.This cover will usually not fit front truck differentials No fill in hole in cover Application:Fit for Following Models:Chevy / GM Intermediates (all A-B-C-G-K-0 Axles), 1964-1995 Chevy / GMC 1/2 Ton 2WD / 4WD Rear ( Will Not Fit 64-70 Trucks with Leaf Springs), 1964-1987 Chevy/GMC 1500 2WD and 4WD 1/2 ton trucks (rear), 1988-20022WD and 4WD Blazers and Jimmys (rear), 1988-19922WD and 4WD Suburbans 1/2 ton (rear), 1988-19992WD and 4WD Tahoes and Yukons (rear), 1994-1999 Sierra 1500 1/2 Ton 2WD / 4WD with 8.5 R.G Rear, 1999 Silverado 1500 1/2 Ton 2WD / 4WD with 8.5 R.G Rear, 1988-1999 Camaro Z28 and Iroc with 8.5" ring gear, 1982-1992 Camaro V8 (will not fit heavy duty), 1993-2002 Buick Grand Nationals, 1984-1987 Firebirds with V8 engines, 1993-2002 Monte Carlo SS, 1983-1987 Olds 442 with 8.5" ring gear, 1983-1987