12 BOLT OLDS REAREND WITH 12 BOLTS ON RING GEAR...HELP!!!!!!

Old 08-16-2008, 03:50 PM
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gungho
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Default 12 BOLT OLDS REAREND WITH 12 BOLTS ON RING GEAR...HELP!!!!!!

I have an olds 12 bolt rearend but it has 12 bolts on the ring gear not ten like it is supposed to please any info wil be a big help,thanks Bryan
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Old 08-16-2008, 05:47 PM
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Tod74
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I have seen the oposite...I got took once when I was in High school cause I bought a rearend thinking it was a 12 bolt cause there was 12 bolts in the cover....but it only had 10 in the ring gear. I learned later that some Olds rearends were like this.

If you have one with 12 in the carier that is a better rear end than the 10.
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Old 08-17-2008, 02:06 AM
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gungho
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I was told all oldsmobile rears had 12 bolts in the cover with 10 on the ring gear,I cant find anything like it anywhere,has anyone? the posi carrier has a 700 cast in it and it has "S" springs holding the cluthes in place noe like chevys regular spring
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Old 08-17-2008, 04:01 AM
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Tod74
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Originally Posted by gungho
I was told all oldsmobile rears had 12 bolts in the cover with 10 on the ring gear,I cant find anything like it anywhere,has anyone? the posi carrier has a 700 cast in it and it has "S" springs holding the cluthes in place noe like chevys regular spring
That is exactly how mine looked...but it only had 10 bolts in the carier and 12 in the cover. Just measure the ring gear that will tell you which one you have for sure.
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Old 08-17-2008, 10:06 AM
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cepx111
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Now I dont know about BOP rearends but I have always thought that when a rearend was refered to as a 10 bolt or 12 bolt, it was in reference to the cover bolt count, not the ring gear bolts.
Tod is exactly right, always measure the ring gear itself and then you'll know for sure what you have.
Heres a link to a olds only site on their rearends.

http://www.oldsmobility.com/10bolt-tech.htm

Goodluck, Charles
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Old 08-17-2008, 10:54 AM
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Tod74
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Originally Posted by cepx111
Now I dont know about BOP rearends but I have always thought that when a rearend was refered to as a 10 bolt or 12 bolt, it was in reference to the cover bolt count, not the ring gear bolts.
Tod is exactly right, always measure the ring gear itself and then you'll know for sure what you have.
Heres a link to a olds only site on their rearends.

http://www.oldsmobility.com/10bolt-tech.htm

Goodluck, Charles
No...it refers to the ring gear bolts...but they normally coincide with each other...That is what I thought back when I bought that one(cover bolts)...but that goof ball olds rearend I had had 12 bolts in the cover, 10 in the ring gear and the axles from a 10 bolt fit it, but the ones from a 12 didn't....best I remember that was 20 years ago...was given the bad news by the guy I hired to build the rearend for me.
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Old 08-17-2008, 02:04 PM
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gungho
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I know what I have i have a 12 bolt olds rear,12 bolts on the cover and 12 on the ring gear .what is measuring the ring gear gonna tell me??is there more than one real 12 bolt olds rear??Im looking to see if anyone can tell me what this is,I was told olds didnt make a real 12 bolt and I cant find one like it anywhere, thanks for any help guys.
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Old 08-17-2008, 02:32 PM
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mytmouz
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Does it have c-clips or do the axles bolt in similar to a 9 inch ford?
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Old 08-17-2008, 03:14 PM
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gungho
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no c-clips it is retained out at the drums,and is a car because it has the ears cast in it for the control arms is about 57.5 from backing to backing
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Old 08-17-2008, 03:27 PM
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Tod74
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http://www.classicoldsmobile.com/tech/73.shtml

http://www.oldsmobility.com/10bolt-tech.htm

Measuring the ring gear will tell you which carier you have..that's what it will tell you.

A "real" 12 bolt as you called it, had an 8.875" ring gear.

http://www.drivetrain.com/gm8.875car.html
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