Richmond Gear 69-0322-1 Ring and Pinion GM 7.5" 7.625" 4.10 Ring Ratio, 1 Pack Richmond ring and pinion gear sets are computer-controlled manufactured from the foundry Gears cut at 1,000th of an inch precision The finished product is heat treated to consistently provide some of the strongest gears possible Engineered to meet or exceed OEM specifications at a great value Extensive testing is performed on all Richmond products