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Technical Pontiac/Olds Rearend TECH...post it here...

Discussion in 'Traditional Hot Rods' started by Ruiner, Sep 4, 2006.

  1. F&J
    Joined: Apr 5, 2007
    Posts: 13,156

    F&J
    ALLIANCE MEMBER

    felpro
     

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  2. willie57
    Joined: Feb 21, 2007
    Posts: 378

    willie57
    Member
    from wisconsin

    thanks for this thread it is very helpful.
     
  3. jerry
    Joined: Mar 2, 2001
    Posts: 3,474

    jerry
    Member

    I picked up the book at Mo-Kan, very well done and full of great info. Nice to have it all in one reference!

    Thanks Fabcraft guys for all your efforts.



    jerry
     
  4. I have a pumpkin from a '57 Olds. rear end if anybody needs it. Not sure gear ratio but it looks good.
     
  5. I'm thinking now that it may be earlier than a '57 because I tried a Felpro 6431 and it was too big in diameter to fit my third member. Does this indicate that it is from an earlier year?
     
  6. F&J
    Joined: Apr 5, 2007
    Posts: 13,156

    F&J
    ALLIANCE MEMBER


    Yes, 56 and earlier. I don't have the number for that one. I made my own recently.
     
  7. Bad Banana
    Joined: Jun 20, 2008
    Posts: 769

    Bad Banana
    ALLIANCE MEMBER
    from Oklahoma

    Ok... reading this it sounds like 47-56 olds rears interchange? What about Pontiac the same years? Buick? I am looking for a complete center section with a 3.07 (0 stamping) from this era. The car is a '55 Olds. Don't care if it needs bearings or seal as I plan on rebuilding it before installing. Currently have a 3.42 in case someone is looking to trade?
     
    Last edited: Sep 16, 2012
  8. 55chieftain
    Joined: May 29, 2007
    Posts: 2,150

    55chieftain
    Member

    The only main differance from what I've seen posted is Olds is 16 spline and Pontiac 10 spline I believe Buick is all by themselves. The side gears are interchangable between the 10 and 16 splines. This early rear goes back to 37, although a change in about 49 where the pinion bearings went from ball to tapered.
     
  9. pila38
    Joined: Mar 25, 2009
    Posts: 731

    pila38
    Member

    I love these rear ends and just got my first one. '57 Oldsmobile housing. Will the '57 Pontiac wheel cylinders work on the '57 Oldsmobile backing plates?
     
  10. kennkat
    Joined: Aug 25, 2011
    Posts: 1,385

    kennkat
    Member

    The 54 - 56 Pontiac (not Olds) rear is 10 splines not 16, I ran one for a while in a 32 Bantam.. I learned a lot about those Pre-57 rears. During that time I also owned a 1939 & 40 Pontiac as well as having bought a few more rears in the 48 - 55 vintage to fill the things appetite for axles.... Lots of interchange in those years, lots of revisions too... 40's types do not have Timken bearings so they have a thrust button on the ring gear....:):):)
     
  11. pila38
    Joined: Mar 25, 2009
    Posts: 731

    pila38
    Member

    Up again for interchanging '57 Pontiac and '57 Oldsmobile wheel cylinders. Sounds stupid, but I'm making my Christmas list and would like to put the wheel cylinders on. ('57 Pontiac are plentiful and...CHEAP).
     
  12. C/Gas55
    Joined: Mar 21, 2006
    Posts: 134

    C/Gas55
    Member

    I believe Rock Auto is where I got my wheel cylinders a couple years back. They were for '57 Olds. Not sure if they cross-referenced with Pontiac or not. Check on their web site and compare the part #'s between the two
     
  13. bcowanwheels
    Joined: Feb 22, 2010
    Posts: 315

    bcowanwheels
    Member

    Dont forget you can buy spools and that housing is in my opinion the best looking hot rod housing ever built but technoligy has made it obsoliete except for its use in hot rods. A 9 inch is the cats meow. Jmo
    bob
     
  14. I touched on this earlier in this thread a couple years ago. I had a pair of 61-62 axle shafts [the shortest 31 spline axles available] splined further up the axle shafts [I think he had to cut the diameter down a bit as they were tapered shafts] and then cut the ends off to fit the '57 housing. It worked ok for me.
     
  15. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,514

    56sedandelivery
    ALLIANCE MEMBER


    Had the exact same problem. My 57 Olds rear end, with a 31 spline positraction, but I also had an old set of aftermarket Strange axles for the later year rear ends (later are one inch longer). I cut one inch off each axle, but one was left with short splines that bottomed out. I looked everywhere for someone to recut the splines longer on the one axle, without any luck. Then I found a guy in Poulsbo, Wa. that primarily does 4 X 4 and off roading stuff; he also does axle splines, but does'nt need the centering divit on the axle end (remember I cut that off to shorten the axles). His price was very reasonable, and he saved my bacon. Butch/56sedandelivery.

    Jantz Engineering is the name. Jantz4X4.com/20555 Pugh Rd. Poulsbo, Wa.
     
  16. Dr. Frankensickle
    Joined: Feb 7, 2007
    Posts: 383

    Dr. Frankensickle
    Member
    from Kansas

    still looking,know of any? pm me thank you.
     
  17. SO Bob
    Joined: May 31, 2012
    Posts: 6

    SO Bob
    Member

    My 62 housing is 57 7/8 flange to flange. I am sure they had allowable tolerances so 57 3/4 would be ball park.
     
  18. 55chieftain
    Joined: May 29, 2007
    Posts: 2,150

    55chieftain
    Member

    Last edited: Mar 5, 2013
  19. Blownolds
    Joined: Mar 31, 2001
    Posts: 2,335

    Blownolds
    Member
    from So Cal

    Cool that someone's putting out a new posi. Doubt they'll sell a million of 'em though, it's expensive. But then again, so is obtaining and restoring an old one.

    Thanks for the input on the whole 10/16 spline pre'57 rears. I never knew that there may have been a difference between Pontiac and Olds on those.
     
  20. KoolKat-57
    Joined: Feb 22, 2010
    Posts: 2,760

    KoolKat-57
    Member
    from Dublin, OH

  21. KoolKat-57
    Joined: Feb 22, 2010
    Posts: 2,760

    KoolKat-57
    Member
    from Dublin, OH

    I don't think .001 will make a difference.
    I'm sure you are going to press them in on a hydraulic press.
    Should be no problem
    KK
     
  22. teufelhund
    Joined: Jan 29, 2012
    Posts: 30

    teufelhund
    Member

    Hey So I have a 50 olds 88 i put a sbc with a turbo 400 tranny and I have been running the stock rear end. Recently i blew through 2 u joints and now the rear end has flared where the u joint mounts up, and I am wondering if there is a place to buy the part new? i think my original dummy neutral drop slightly flared it and now its giving me trouble. Another option is a chevy rear end. thoughts or ideas welcome! thanks guys.

    Teufelhund
     
  23. 37willysgasser
    Joined: Jul 24, 2007
    Posts: 764

    37willysgasser
    Member

    call Brad at fabcraft he has all the stuff you need for olds rears, he sells new yokes also. heres mine all new parts and yoke from Brad:
     

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    Last edited: Mar 7, 2013
  24. KoolKat-57
    Joined: Feb 22, 2010
    Posts: 2,760

    KoolKat-57
    Member
    from Dublin, OH

    Yeah, Pretty much a bullet proof combo!
    KK
     
  25. dan griffin
    Joined: Dec 25, 2009
    Posts: 416

    dan griffin
    Member

    49-50 Olds rear end speed secrets. 56Pontiac yoke big U joint, 57-58 Pontiac axles and side gears. Put a brace across the back to keep the housing from bending. Its 8-3/4 like a Mopar.
     
    chickenshift likes this.
  26. 1994Vulture
    Joined: Mar 31, 2011
    Posts: 6

    1994Vulture
    Member

    Looking for some information. Bought a car with rear that is from a dragster. Casting number is 518261 and also has a code of F or E 32 on it.
    I think that is the correct casting number it sets so low hard to tell. It does have only two ribs on divers side.
    Any help would be great
    Thanks
    Dale
     
  27. jesse1980
    Joined: Aug 25, 2010
    Posts: 1,357

    jesse1980
    Member

    Fabcraft has a awesome book about these rearends, I just bought it. If you are into theses rearends, the book is a must.
     
  28. bryan6902
    Joined: May 5, 2008
    Posts: 1,137

    bryan6902
    Member

    So I have a bearing question. I bought a wheel bearing from Rock Auto. It is Timken part # 514003. I got the part and it looks slightly different. It's now a completely sealed bearing and has no groove on the outer race. The groove is for the o-ring that seals that outer race to the axle housing itself. Now I was about to return it but got to thinking.... If I put this back in with the new paper gaskets, the o-rings are just a redundant seal. I've looked around at other online sources and this is the part number that comes up again and again. The guy at Rock Auto said this was the new, updated part and is correct.

    What do you guys think? Put it in with new paper gaskets or ship it back?
     
  29. gasserjohn
    Joined: Nov 9, 2008
    Posts: 1,219

    gasserjohn
    Member

    yes is good info.......have olds rear summers bros spool/axles 5.38 gears been working great for many/many years..................
     
  30. landseaandair
    Joined: Feb 23, 2009
    Posts: 4,362

    landseaandair
    Member
    from phoenix

    Has been a while since I put one of these together, but I'm pretty sure there's supposed to be a seal inboard of the bearing that would make an O ring on the bearing pointless. I also never bothered with the paper gaskets either.
     

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