Page 1 of 3 123 LastLast
Results 1 to 10 of 21

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

  1. #1
    Senior Member EXPERT BUILDER
    Join Date
    May 2004
    Posts
    298

    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

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    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.

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    May 2004
    Posts
    298
    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

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    Quote 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.

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    May 2006
    Posts
    2,044
    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
    ***IN GOD WE TRUST***

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    Quote 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.

  7. #7
    Senior Member EXPERT BUILDER
    Join Date
    May 2004
    Posts
    298
    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.

  8. #8
    Senior Member RACING JUNKIE mytmouz's Avatar
    Join Date
    May 2006
    Location
    Pelahatchie, MS
    Posts
    980
    Does it have c-clips or do the axles bolt in similar to a 9 inch ford?
    If you think nobody cares, try missing a payment...

  9. #9
    Senior Member EXPERT BUILDER
    Join Date
    May 2004
    Posts
    298
    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

  10. #10
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    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


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy