Rich 71 Posted October 29, 2023 Share Posted October 29, 2023 I have a 10 bolt in my 71 with ACC 6100 1 stamped on rear what gear is it Quote Link to comment Share on other sites More sharing options...
420ponies Posted October 29, 2023 Share Posted October 29, 2023 should be able to see the coding and rear axle ratio in our resources page. It's at the top in the red banner. when it comes up, scroll down to decoding rear axle. It should be in there. my ('72) 10 bolt was a 2:73 posi-traction. 1 Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted October 29, 2023 Share Posted October 29, 2023 Jim is right look it up to be sure but if it is a base model it's probably 273 open rear end. 1 Quote Link to comment Share on other sites More sharing options...
jft69z Posted October 29, 2023 Share Posted October 29, 2023 6 hours ago, Rich 71 said: I have a 10 bolt in my 71 with ACC 6100 1 stamped on rear what gear is it That number doesn't appear to be on the lists. Can you take a picture of it, should be on the passenger side axle tube, facing the front. Take a picture of the rear cover, and casting numbers too. It's possible it could be a BOP (Buick, Olds, Pontiac) rear diff too. https://chevellestuff.net/1971/rear_axle.htm Another thread where someone asked about an 'ACC' code. https://www.chevelles.com/threads/rear-axle-code.524321/ 1 Quote Link to comment Share on other sites More sharing options...
DragCat Posted October 29, 2023 Share Posted October 29, 2023 I'd verify the old fashioned way, spin the driveshaft and count spins 🤣 No telling what someone else has done 3 Quote Link to comment Share on other sites More sharing options...
Dtret Posted October 29, 2023 Share Posted October 29, 2023 I looked also and couldn’t find any definitive information about it. 2 Quote Link to comment Share on other sites More sharing options...
420ponies Posted October 30, 2023 Share Posted October 30, 2023 I found something on Wallace Racing . shows a "AC " code (2:78 ratio) from'71-'72 Grand Prix? no other information on that site. 3 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.