1973-UP Chevy/GMC Truck Chrome Steel Rear Differential Cover - 14 Bolt w/ 9.5" Ring Gear Chevy/GMC chrome steel rear differential cover with 14 bolt pattern. Fits 14 bolt Chevy/GMC trucks with 9-1/2" ring gear. Fits 1973-87 Chevy/GMC 3/4 Ton & 1 Ton Truck 2WD - Rear. Fits 1981-UP Chevy/GMC Truck with 9.5" Ring Gear - Rear.