The EXCEL from Richmond GM75373OE is a 3.73 ratio ring and pinion gear set built for the GM 7.5/7.6/7.625 in. 10-Bolt axle. Swapping in a different gear ratio is one of the most direct ways to change how a vehicle accelerates, tows, and cruises, and it is also the fix when a worn or chipped set starts to whine or clunk under load. It fits select Chevy, GMC, Pontiac, Buick, Oldsmobile, Cadillac, Hummer & Isuzu vehicles from 1972 to 2013; the complete vehicle application list appears below. The ring gear is machined from 8620 Steel and the ring and pinion are supplied as a matched set that must be installed together. Carrier compatibility matters on this axle: this set requires a 3.23 Ratio and Higher carrier.

EXCEL from Richmond GM75373OE Compatibility Notes:

• Designed for the GM 7.5/7.6/7.625 in. 10-Bolt axle
• 3.73:1 final drive gear ratio
• 41-tooth ring gear paired with a 11-tooth pinion
• 27-spline pinion shaft accepts the matching pinion yoke
• Pinion shaft diameter: 1.438 in.
• Ring gear rotation: Standard
• Ring gear material: 8620 Steel
• Requires a 3.23 Ratio and Higher carrier
• Professional installation is recommended: pinion depth, bearing preload, and backlash must be set and confirmed with a gear marking compound pattern check, followed by a proper gear break-in.

EXCEL from Richmond GM75373OE Vehicle Applications:

• Chevy: 1985-2005 Astro; 1995-2001 Blazer; 1982-2002 Camaro; 1977-1996 Caprice; 2004-2013 Colorado; 1991-1994 Commercial Chassis; 1977-1987 El Camino; 1977-1985, 1994-1996 Impala; 1975, 1978-1983 Malibu; 1978-1988 Monte Carlo; 1976-1979 Nova; 1982-2004 S10; 1983-1994 S10 Blazer
• GMC: 2004-2012 Canyon; 2002-2005 Envoy; 2002-2005 Envoy XL; 2004-2005 Envoy XUV; 1992-2005 Jimmy; 1982-1990 S15; 1983-1991 S15 Jimmy; 1985-2005 Safari; 1991-2004 Sonoma; 1991 Syclone
• Pontiac: 1975-1986 Bonneville; 1975-1981 Catalina; 1977-2002 Firebird; 1978-1980 Grand Am; 1977-1983 Grand LeMans; 1977-1987 Grand Prix; 1975-1978 Grand Safari; 1977-1981 Laurentian; 1977-1981 LeMans; 1977-1986 Parisienne; 1977-1979 Phoenix; 1972-1977 Ventura
• Buick: 1973-1975 Apollo; 1977-1981 Century; 1991-1996 Commercial Chassis; 1976-1985 Electra; 1977-1983 Estate Wagon; 1975-1985 LeSabre; 1977-1979 Opel; 1977-1987 Regal; 1977-1978 Riviera; 1991-1996 Roadmaster; 1975-1979 Skylark
• Oldsmobile: 1977-1984 98; 1991-1994, 1996-2004 Bravada; 1977-1984 Custom Cruiser; 1977-1981, 1985-1987 Cutlass; 1978-1984 Cutlass Calais; 1980-1983 Cutlass Cruiser; 1977-1980, 1985-1987 Cutlass Salon; 1977-1988 Cutlass Supreme; 1977-1985 Delta 88; 1976-1979 Omega
• Cadillac: 1987-1990 Brougham; 1982-1984 DeVille; 1982-1990 Fleetwood
• Hummer: 2006-2010 H3; 2009-2010 H3T
• Isuzu: 2003-2008 Ascender; 1981-1995 Pickup; 1991-2002 Rodeo; 2001-2002 Rodeo Sport