Only about 3000 68s and 69s did not have positraction out of almost 70,000 68 and 69 Corvettes produced. So almost all C3s had posi.
Posi rearend?
Melting Slicks
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From: Bay Area CA
Drifting
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From: Upstate South Carolina
Team Owner
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The optioned code and cost for the Posi-traction was listed through '76. Perhaps that was only for someone who wanted to delete that option. What reference do you have for Posi being standard equipment in 1970?
Drifting
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From: Upstate South Carolina
1970-1972 NCRS Technical Information and Judging Guide page 109, "Limited slip or Positraction differential is standard equipment on all vehicles for all three years."
The NCRS guide isn't 100% correct but I think it is the best reference there is.
The NCRS guide isn't 100% correct but I think it is the best reference there is.
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Drifting
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From: Upstate South Carolina
Not sure why G81 would still be listed. Black Book shows G81 as optional rear axle ratio for 70, positraction prior to 70. Tank stickers show G81 as positraction and ZQ8 and ZQ9 for economy and performance ratios as applicable. Every 70 tank sticker I have seen lists G81 positraction but the matching window stickers do not list postitraction as an option. Every reference I have seen states that posi came standard with all Corvettes starting in 70.
Last edited by mstanton; Jul 12, 2009 at 06:01 PM.
Race Director
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From: Forked River NJ
My Corvette Black Book states right in it that in 70 Positraction became standard. All my other books do not show a standard or open diff available from 70 on up, 69 and previous showed a standard or open axle.
Drifting
Joined: Jun 2003
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From: Upstate South Carolina
Looking at Corvette by the Numbers, it appears that AK and AS were the only two codes in 69 that were not posi.
Last edited by mstanton; Jul 12, 2009 at 11:22 PM.
