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  1. #26
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    Default

    Whatís the easiest way to identify either itís the 9 3/8s or 8 7/8s.

    sorry Per, i totally missed that you had asked me another question.

    i should be heading back down to Florida after the first of the year and once there i'll have access to my pictures and the various rears again. i'll get that info reposted.

  2. #27
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    Smile

    Thanks Bobkmando.

    I am looking forward to see the pictures.

    Happy new year from me up in North Norway.

    Per Arne
    Per Arne Sund, North Norway and Cranfills Gap Tx

  3. #28
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    hope this helps, between having to back up to fit the entire assembly in the frame and the low resolution allowed by the board you can't see much.

    the 9 3/8" is the 12 bolt cover housing at the top.

    the 8 1/2" is the 10 bolt cover housing on the bottom.

    the 8 7/8" is also a 10 bolt cover.

    i got the 8 7/8" out of ( in fact, we put it back IN ) a 1976 Electra. the 9 3/8" was out of a 1971 Electra. the provenance of the 8 1/2" is unknown but it was a bolt in replacement to the 71 Electra.
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  4. #29
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    Thumbs up

    Thanks for the info Bobkmando.
    I am going to figure what I have, when I get the car home, probably sometime early in February.
    And it will be interesting to check out how it behaves on snowy and icy roads over here, to see if I need a posi or not.
    I used a 74 Impala as my driver last winter and I had no problems to get around with it and it didnít have a posi.
    But since these cars are heavy, I suppose that helps a lot.
    Here are picture of the Impala, not any car to drive around with if you want to be anonymous.
    It was painted like this when I bought it.



    Per Arne Sund, North Norway and Cranfills Gap Tx

  5. #30
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    Feb 2006
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    Default

    Greetings to the posters on this thread. It looks like there is a lot of knowledge here. Perhaps you can help ID the rear end I an tring to sell.
    Here's the link to the post, and a pic.

    thanx,

    http://www.v8buick.com/showthread.php?t=95414
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  6. #31
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    Default

    (posted earlier by jamyers)

    '67 to '70 Riv: One UCA and a panhard rod, L & R carrier brngs different
    '67 to '70 E/L/W: 2 UCA and no panhard rod, L & R carrier brngs different

    I've only seen up close the posi rear end on a 70 Wildcat - the housing and the mounts looked exactly like my 69 Electra's peg-leg. Is there any difference in the axle housings between Riv's and E/L/W's? Can I take a Riv posi and swap it into an E/L/W? Can I just swap the posi differential into any 67-70 open housing? Would I need the axles also or could I use the ones from the open housing? Let's say I get lucky and happen to find posi in a local yard. What is the best way to "field test" (i.e. it is a functional posi unit, the clutches are in good shape, etc.) before I buy the thing? I'm a still a little too cloudy to start scouring - any help is appreciated.
    What does not destroy me, makes me stranger.
    CURRENT: - 1999 Buick Park Avenue Ultra THE ULTRA LOUNGE
    PRIOR: 1996 Lesabre THE LOUNGE
    RIP 10/31/08 totalled in head-on collision
    - 1969 Electra 225 Limited Sedan parts car
    RIP 2008(pices all over the world)
    - 1966 Buick Riviera parts car
    RIP 2007(pieces all over the world)
    -1969 Electra 225 Coupe daily driver 8 years
    RIP 2008 parted & euthanized (terminal cancer i.a.) (pieces all over the world)

  7. #32
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    Default

    I finally got around to digging out and posting the codes from my '71 Chassis Manual on rear ends for a thread in the "For Sale" section, so I'll post it here as well so it doesn't get lost.

    The first digit indicates the axle type:
    L=A-body 8.5
    N=B-body 8.5
    Q=B & C -body 9 3/8

    the second indicates the ratio, and A-bodies had these:
    K=2.56 open
    T=2.56 posi
    L=2.73 open
    O=2.73 posi
    A=3.08 open
    S=3.08 posi
    H=3.42 open
    W=3.42 posi

    B-bodies (LeSabres) with 350 engines (and wider 8.5 axles) had these:
    A=3.08 open
    P=3.08 posi
    H=3.42 open
    S=3.42 posi
    K=2.73 open
    T=2.73 posi

    B-bodies (LeSabres) with 455 engines, and C-bodies (except Estate Wagons) had 9 3/8" ring gear axles with these codes:
    P=2.73 open
    S=2.73 posi
    I=2.93 open
    J=2.93 posi
    T=3.42 open
    A=3.42 posi

    C-Body Estate Wagons had leaf spring 9 3/8" ring gear axles.
    E=2.93 open
    L=2.93 posi
    H=3.42 open
    M=3.42 posi
    I=2.93 open

    And the third indicates the axle manufacturer
    B=Buick
    O=Olds
    C=Chevy
    K=GM Canada
    James BPG #1604
    Still own my first car: '71 LeSabre - the 2NABOT (formerly the World's 2nd Fastest 350-powered Big Buick) Now 455-powered.
    '62 Ranchero w/ '68 200 Six and Column-shift 3-speed. Cruuuuuise-mobile.

  8. #33
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    Default

    Pyro225, I don't know for sure, I was just summarizing info from other threads. But if I recall, the Riv rear end was different, so you can't swap the whole housings.

    But you can swap the internals within "generations" of axles.
    James BPG #1604
    Still own my first car: '71 LeSabre - the 2NABOT (formerly the World's 2nd Fastest 350-powered Big Buick) Now 455-powered.
    '62 Ranchero w/ '68 200 Six and Column-shift 3-speed. Cruuuuuise-mobile.

  9. #34
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    Endicott NY
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    Default Re: 9 3/8" rear differences

    Pretty informative thread, wish i understood it a bit more to be honest with you guys...Im taking my car out today for the first time in a few years, and I love it, dont get me wrong, really have missed this car to the point that I cant sleep tonight...but the thing that kills me about it, is the highway gears it has in it, absolutely kills it to me sometimes...its got the power but not the acceleration..

    That being said I coincidentally have a rear end out of a 70 chevelle which I know I cant use, but its got new 4.11 gears in it....is there anyway I can use these gears somehow in my rear? If not what can I do about this gear situation...Id like to move to atleast a 3.42 but more preferebly a 3.73-4.11

    Car is a 66 LeSabre w/ 340....any help is appreciated.
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  10. #35
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    Default Re: 9 3/8" rear differences

    i'm sure somebody will chime in to tell you what you actually have.

    if you happen to have one of the rear's with no aftermarket support you could always swap in a 5 speed manual trans ....

  11. #36

    Default Re: 9 3/8" rear differences

    If you (somehow) make the 4.11's work with your car, you will HATE the car on the highway....same with the 3.73's.
    Adam Martin
    BPG# 1358
    BCA# 39765
    1970 Buick Skylark Custom 455 Coupe
    www.antiqueautomotiveservice.com

    http://www.antiqueautomotiveservice.com/images/logo_top.gif

  12. #37
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    Default Re: 9 3/8" rear differences

    If you (somehow) make the 4.11's work with your car, you will HATE the car on the highway....same with the 3.73's.

    not if he installs a 5 speed manual transmission!

  13. #38
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    Default Re: 9 3/8" rear differences

    Your LeSabre has rhe smaller Skylark gears-not the 9 3/8
    Dan
    mostly Buicks-Pontiacs

  14. #39
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    Default Re: 9 3/8" rear differences

    so what is that? that's before the 8 1/2" rear, yes? so it's 8 1/4"?

  15. #40
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    Default Re: 9 3/8" rear differences

    66LeSabre,

    Your '66 LeSabre with a 340 will have a Buick cast 8.2 housing with '64-69 Pontiac 8.2 gears inside. Desiring your rear to have a posi, & say it now has 2.93, 3.08, or 3.23 gears, either search for a good mid ratio 4 pinion Pontiac Safe-T-Track carrier, or ck out what Eaton & Auburn offer in a mid ratio Pontiac 8.2 carrier. Wanting lower gear ratio, than a 3.23, will need to find nice used 3.36's or buy new 3.55's & go with a low ratio carrier. While the Chevelle 12 bolt won't fit in the LeSabre, shouldn't be too hard to find a buyer for it, & that should help go a long way to getting the ratio & posi of your choice under your LeSabre. Last, if you're planning on throwing 450 ft lbs or more of torque at the LeSabre's 8.2, you'll e better off going with a stronger rearend to build up.

    Got Posi?

    Roger

  16. #41
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    Endicott NY
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    Default Re: 9 3/8" rear differences

    Thanks for the respones guys...Guess I got some researching to do but I appreciated the start...

    Car is never on the highway, I think maybe once or twice in the 4 years Ive had it...just an in town car.
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  17. #42
    Join Date
    Jan 2006
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    40

    Default Re: 9 3/8" rear differences

    there was a demo derby guy around here that was playing with a lathe and made a spool fit the 12 bolt might have been a ford 9 inch?
    got buick?

  18. #43
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    Default Re: 9 3/8" rear differences

    I thought it was time to poke a stick at the hornets nest again and add some confusion to the situation. I've taken two posi carriers from full size Olds cars, like Delta 88/98's which have been from the early 70's, like 72/73. The rear axles on these cars look very much like the rear axles on the big Buicks from 71-76 with the 9 3/8. Twelve bolts on the cover with twelve bolts on the ring gear. They also have axle shafts that slide out by removing four bolts behind the brakes, just like on the Buick. As you can see, there's a difference in the thickness of the ring gear, and there is also a difference in the carrier design, probably similar to the 2.73-3.23 / 3.42 variation on the Buicks. I don't have the pinion gears, so I don't know what the ratios were (I remember vaguely calculating a 3.08 on one of them). It's also interesting to see that the ring gears have such a similar amount of teeth on them. I'm not sure if they're the same as the Buick's, but it would be fun to find out. I will have to get a better picture from the side, so we can start looking for clues.. to be continued.
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    Kimson
    1966 Wildcat


    - 1972 Centurion (R.I.P.)
    - 1973 Riviera (sold)



  19. #44
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    Default Re: 9 3/8" rear differences

    I'm pretty sure that the 9 3/8" axles were actually made by Olds, at least originally, then they became part of the BOP parts bin.

    I'll bet that those two carriers are different series for the different ratios, but otherwise are interchangeable.

    Why didn't you take the pinions as well? If one of those is a deep gearset, it's not much use without it.
    James BPG #1604
    Still own my first car: '71 LeSabre - the 2NABOT (formerly the World's 2nd Fastest 350-powered Big Buick) Now 455-powered.
    '62 Ranchero w/ '68 200 Six and Column-shift 3-speed. Cruuuuuise-mobile.

  20. #45
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    Default Re: 9 3/8" rear differences

    I thought the carriers were all the same until I read the thread again, and I didn't think much of getting the gears (until now). I've got an open 3.42 axle laying here too, I'll have to see if one of the posi carriers match up to the open 3.42 carrier.
    Kimson
    1966 Wildcat


    - 1972 Centurion (R.I.P.)
    - 1973 Riviera (sold)



  21. #46
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    Default Re: 9 3/8" rear differences

    I've taken two posi carriers from full size Olds cars, like Delta 88/98's which have been from the early 70's, like 72/73.

    I'm pretty sure that the 9 3/8" axles were actually made by Olds


    yes. ALL of the 9 3/8" housings were made by Oldsmobile, regardless of which make you find the rear in.

    and all of the 8 7/8" rears are made by Pontiac although the entire axle assembly will bolt in, in place of a 9 3/8".

  22. #47
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    Default Re: 9 3/8" rear differences

    Quote Originally Posted by bob k. mando View Post
    yes. ALL of the 9 3/8" housings were made by Oldsmobile, regardless of which make you find the rear in.
    The confusion continues, but there is some light in the tunnel as to decipher the Olds/Buick relation in the 9 3/8 world. Here's a picture of the differentials I have laying around. As you can see on the top of each of the carriers there is a design difference.

    Carrier No.1 as seen from the left is the open 3.42 Buick 9 3/8 diff taken from a '72 Electra I believe it was. The carrier has the number 759 marked on the top of it. The ring gear has the following code: 41B12 GM PA119 2, of course 41/12 gives the ratio of 3.42.

    Carrier No.2 in the middle is an Olds 9 3/8 taken from a 71/72/73 Delta 88/98 which has number 761 marked on top of it. The ring gear has the following code: 42B13 GM DN227 1, of course 42/13 gives the ratio of 3.23. I guess I should have taken the whole axle

    Carrier No.3 to the right is an Olds 9 3/8 taken from a 71/72/73 Delta 88/98 which has number 760 marked on top of it. The ring gear has the following code: 41B16 GM H329 1, of course 41/16 gives the ratio of 2.56. You kind of wonder why someone would match a 2.56 gear ratio with a posi?

    It would be interesting to take a look at a few more carriers from the 71-76 9 3/8 generation to see if the 759-761 series continues for the different versions available, to determine which carrier fits which gears etc. We have seen one thing, and that is that the 2.56 ratio has a different carrier to the 3.23 ratio (could it be a Olds thing only?), since the 2.56 wasn't available for the big Buicks.
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    • File Type: jpg 3.jpg (81.8 KB, 70 views)
    Kimson
    1966 Wildcat


    - 1972 Centurion (R.I.P.)
    - 1973 Riviera (sold)



  23. #48
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    Default Re: 9 3/8" rear differences

    The numbers look like they're put on there in a differently designed way though.
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    Kimson
    1966 Wildcat


    - 1972 Centurion (R.I.P.)
    - 1973 Riviera (sold)



  24. #49
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    Default Re: 9 3/8" rear differences

    We once used a 2.56 Olds posi carrier with a 2.93 gear and it took a roughly 1/4" ring gear spacer to make it happen. You could do the same thing with a 2.73-3.23 carrier and a 3.42 gear.
    That was a strange deal. It was a '70 Olds carrier from a Delta, going into a 73 rearend. The spline pitch in the '70 side gears did not match that of the 73 axles. 70 axles were too short for the 73 rearend. Spline count was the same at 31. We had to get the 73 axles cut to match.
    David Powell
    76 LeSabre 2dr 455 12.54@107
    76 LeSabre 4dr ht 455 14.50@93
    73 Riviera 455
    83 Regal 455 11.70@116

  25. #50
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    Default Re: 9 3/8" rear differences

    the 3.42 looks like a heavy duty unit (extra ribs), as one might expect for something likely to see towing ( drag? ) duty.

 

 
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