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Old 10-22-2005, 01:28 PM
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olds rearend info needed

hi guys,I'm in need of some info.i have a 69 olds cutlass with a 12 bolt rear end but i am sure it is an 'o' type rear with an open spool.I would like to know if their is any posi units that will swap in other than to try and track down an original unit. As well is this type of rear end worth the trouble? Axles look weak compared to my 9".I have been told that olds are something different than most standard Chevy products

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Old 10-22-2005, 04:56 PM
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Everything I see involving GM 12 bolt rear end from that year range just identifies it a "GM"...Not Chevy,Old,Pontiac Etc. I think they were all the same.
I replaced the original Posi carrier in mine with an Eaton unit, and it seems to be a good unit.
JA

Last edited by johnnya; 10-22-2005 at 05:05 PM.
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Old 10-23-2005, 07:04 AM
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Quote:
Originally Posted by hammerhead
hi guys,I'm in need of some info.i have a 69 olds cutlass with a 12 bolt rear end but i am sure it is an 'o' type rear with an open spool.I would like to know if their is any posi units that will swap in other than to try and track down an original unit. As well is this type of rear end worth the trouble? Axles look weak compared to my 9".I have been told that olds are something different than most standard Chevy products
If you have not removed the cover yet, I would before you go very far. I have seen a few Olds 12 bolts that had 10 bolt carriers in them. It would be worth your time to check.
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Old 10-23-2005, 11:13 PM
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Olds had an orphan "12-bolt" back then. I've heard it wasn't too great. Here's some info:

http://www.oldsmobility.com/10bolt-tech.htm
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Old 10-23-2005, 11:25 PM
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Thanks for the input jonnya im curios if the posi unit you put in was a clutch type or a metal tooth type ( for lack of better wording)Richmond has a newer product out that has some type of metal teeth that will mesh or let go when needed(powertrax),curious how well they work.
Also appreciate the input one 1ownerT, I have not pulled the cover of but I have pulled the axles before to change seals and bearings and obliviously they did not have the "c" clips as the Chevy 12 bolts,only axle retaining nuts behind the rear brake drums.I was told by somebody all Canadian built olds had Chevy style 12 bolts,So iwill have to check into this further . Thanks
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Old 10-24-2005, 12:53 AM
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Thanks jimfulco,checked your info on the website ,checked the rear with flashlight in hand.It is a type'o' rear, i'm not sure if thats good or bad but it is a Olds attempt at a Chevy 12 bolt. Its gotta be better than the other options.
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