Editing Rearend identification (section)
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====8.5 inch 10-bolt==== Sometimes referred to as the "corporate 10-bolt", the GM 8.5" 10-bolt rearend began production in 1971 to replace the 8.2" and 12-bolt rearends. There was simultaneous use of the 8.2" and 8.5" rearends during the changeover period, like in the Nova. Has a 10 bolt cover as well as 10 bolts securing the ring gear. Ring gear bolts are 7/16 - 20 LH threads (also shared with the 7.5/7.625"). The 8.5" 10-bolt GM rearend has a 30 spline pinion, uses C-clips, and could have 28 or 30 spline axles depending on the year (30 spline axles were used after 1988). 4 wheel drive 8.5" front differentials manufactured between 1977-91 share the same differential gears, bearings, and pinion seals but has a modified housing and cover which has an indentation to clear suspension travel. It uses a 1-1/4" pinion nut. Ring gear diameter was increased to 8.6" when used with the GMT800 platform light duty trucks (1999-06 Silverado/Sierra). <table bgcolor="#F9F9F9" table border="1" cellpadding="2" cellspacing="0"><tr> <td> Apollo: 1973 - 1975 </td><td> Bel Air: 1970 - 1975 </td> </tr><tr> <td> Blazer: 1979 - 1994 </td><td> Bonneville: 1970 - 1986 </td> </tr><tr> <td> C10 1/2 Ton (2WD): 1979 - 1987 </td><td> C15/ C1500 1/2 Ton (2WD): 1979 - present </td> </tr><tr> <td> C1500 1/2 Ton (2WD): 1988 - 1998 (incl. GMT400-based Blazer (92-94), Tahoe/Yukon, Escalade, Denali, 1/2 ton Suburban) </td><td> Camaro: 1970 - 1981 </td> </tr><tr> <td> Caprice: 1970 - 1996 (includes '94-'96 Impala SS and 9C1 police package) </td><td> Catalina: 1970 - 1981 </td> </tr><tr> <td> Chevelle/Malibu: 1973 - 1973 </td><td> Cutlass: 1970 - 1977 </td> </tr><tr> <td> Cutlass: 1985 - 1987 (442 package) </td><td> El Camino: 1971 - 1976 </td> </tr><tr> <td> Electra: 1971 - 1989 </td><td> Firebird: 1970 - 1981 </td> </tr><tr> <td> G10 1/2 Ton: 1979 - 1989 </td><td> G15/ G1500 1/2 Ton: 1979 - 1988 </td> </tr><tr> <td> G20 3/4 Ton: 1975 - 1989 </td><td> G25/ G2500 3/4 Ton: 1978 - 1988 </td> </tr><tr> <td> Grand Prix: 1971 - 1987 </td><td> GTO: 1970 - 1977 </td> </tr><tr> <td> Impala/Caprice: 1971 - 1996 ('77-'96 B, C, and D platform for station wagons, diesels, 9C6 (taxicab) and 9C1 police package </td><td> K10/ K1500 1/2 Ton (4WD): 1979 - present </td> </tr><tr> <td> K15/ K1500 1/2 Ton (4WD): 1979 - present </td><td> K5 Blazer (4WD): 1979 - 1991 (1979-'82 are overlap years - also applicable to C/K 10 series incl. Suburban </td> </tr><tr> <td> LeMans: 1971 - 1983 </td><td> Malibu: 1973 - 1983 </td> </tr><tr> <td> Monte Carlo: 1973 - 1978 </td><td> Nova: 1970 - 1979 </td> </tr><tr> <td> Omega: 1973 - 1979 </td><td> Phoenix: 1978 - 1979 </td> </tr><tr> <td> Regal: 1973 - 1987 </td><td> Regal: 1985 - 1987 </td> </tr><tr> <td> Riviera: 1975 - 1978 </td><td> Skylark: 1970 - 1972 </td> </tr><tr> <td> Skylark: 1975 - 1979 </td><td> S10,Sonoma: 1995 - 2003 (4WD with ZR2 option, S10 SS, Xtreme, and 4.3L trucks with a manual transmission option </td> </tr><tr> <td> Suburban 1/2 Ton: 1979 - 1991 </td><td> Suburban 1/2 Ton: 1979 - 1991 </td> </tr><tr> <td> Suburban 1/2 Ton: 1979 - 1991 </td><td> Suburban 1/2 Ton: 1979 - 1991 </td> </tr><tr> <td> Trans Am: 1970 - 1981 </td><td> Ventura: 1976 - 1977 </td> </tr> </table><br>
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