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  1. #76
    Join Date
    May 2008
    Location
    Poland......far from anywhere
    Posts
    469

    Default Re: 9 3/8" rear differences

    I wanted to ask a question about shafts,if i have 3.07 open diff and i put there 3.07 posi will shafts work?
    Kacper


  2. #77
    Join Date
    Feb 2002
    Location
    SW Ohio
    Posts
    400

    Default Re: 9 3/8" rear differences

    Yes, the axle shafts are the same.
    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

  3. #78
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,246

    Default Re: 9 3/8" rear differences

    Just noticed some more interesting 9-3/8" detail according to my parts book...sorry if it's already been mentioned.

    I'm finding some gearsets w/the same part numbers from 1965-1970. We know carriers changed within those five years, but can anyone confirm gear commonality?

    I'm seeing some interesting ratios, too:

    2.56:1 1967-1970
    2.78:1 1965-1970
    3.07:1 1965-1969
    3.23:1 1965-1966 (three different part numbers for this ratio)
    3.36:1 1965
    3.42:1 1965-1970 (three different part numbers for this ratio)
    3.58:1 1965
    3.91:1 1965-1970
    4.45:1 1965

    Something else - in 1965 the gearset part numbers are different between posi and open carriers.

    Devon
    Last edited by DaWildcat; 06-13-2009 at 09:24 AM.
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  4. #79
    Join Date
    Aug 2008
    Location
    Cottage Grove Mn
    Posts
    5

    Default Re: 9 3/8" rear differences

    looking for rear axle that will fit under my 1956 buick special??? needs to have 5 on 5 bolt pattern and a tail ratio. my 56 has a closed drive shaft want to update.

  5. #80
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,246

    Default Re: 9 3/8" rear differences

    Quote Originally Posted by polaris View Post
    looking for rear axle that will fit under my 1956 buick special??? needs to have 5 on 5 bolt pattern and a tail ratio. my 56 has a closed drive shaft want to update.
    Try posting your question in the "Got Gears?" forum, since this thread is specifically regarding the 9-3/8" rear axles. There will probably be better, more modern options than trying to adapt one of the big car rear ends.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  6. #81
    Join Date
    Feb 2004
    Location
    N.E. Ohio
    Posts
    375

    Default Re: 9 3/8" rear differences

    Just some stuff you may or may not find interesting after i popped the cover off a 68 Electra POSI rear diff.
    #'s stamped into RG: 1385323 39-14 GMC 54 (in yellow paint)
    cast into right side of carrier: ED 02120 D 260
    left side cast between webbing: 120 2
    left side RG mounting flange of carrier: L 12 H
    Left main cap also wider than the right side.
    I'll see if i can get some pics up of this 2.78 geared POSI rear.
    Attached Images Attached Images
    My past Buicks: Starting with first car at 16 for $200
    71 Skylark Custom w/455 and GS hood
    75 Century 350-2
    68 Skylark Custom w/skirts 350-2
    74 Apollo w/462 Pontiac
    85 LeSabre "Collector Ed."
    69 Skylark 350-4
    73 Century 350-4 (SF455)
    Tim D.

  7. #82
    Join Date
    Jan 2003
    Location
    Connecticut
    Posts
    5,506

    Default Re: 9 3/8" rear differences

    Quote Originally Posted by quicksabre View Post
    Here are the Auburn plates and springs installed. The fit is absolutely perfect, but this provides tons of preload- more than I was really looking for. It will probably chatter really bad. We'll see. I will be testing it soon.
    Hey Dave-

    Wondering if you're still running this same set-up and if it's holding up on both the street and strip. If so, do you know what part numbers the Auburn parts are and if they are available new? I have a posi rear, but when the back end is up with one person holding a tire the other can be turned fairly freely, so I assume the clutches are shot. Seems like you've found a good, simple, and inexpensive solution, just hoping it's still working well.
    Ken Lisk
    Happiness is a long smokey burnout.
    '71 Limemist GSX, Restored 2010 by Gran Sport Garage, aka Nick Serwo
    '72 Riviera, Crystal Blue
    '63 225 'Vert Bahama Blue
    BPG# 1409
    NE-GS/GN Member
    ROA Member# 12258
    GSCA Member# 1176
    AACA Member# 993257

  8. #83
    Join Date
    Feb 2002
    Location
    SW Ohio
    Posts
    400

    Default Re: 9 3/8" rear differences

    Ken, it still seems to be holding up quite well. I change tires with both of them off of the ground, and it doesn't even slip when I torque down the lugnuts. That S-spring deal hardly provides any preload at all.
    The plates and springs came out of the old factory installed 8.5" Auburn posi(which was replaced with an Eaton posi) that was in my '96 9C1 Caprice. So I assume it is the Auburn Gear Spring Retainer Service Kit 541018, by looking at their catalog. 541019 could be the same plates with even higher pressure springs, it's for the Pro Series 8.5" posi. But since my parts came from an OEM application, I'm pretty sure it was the standard model. No mods required, they fit right in as long as you can compress the springs down enough.
    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

  9. #84
    Join Date
    Jan 2003
    Location
    Connecticut
    Posts
    5,506

    Default Re: 9 3/8" rear differences

    Thanks for the update, Dave, I appreciate it. Glad it's still holding up for you. I think I may make the same upgrade before I install the posi.
    Ken Lisk
    Happiness is a long smokey burnout.
    '71 Limemist GSX, Restored 2010 by Gran Sport Garage, aka Nick Serwo
    '72 Riviera, Crystal Blue
    '63 225 'Vert Bahama Blue
    BPG# 1409
    NE-GS/GN Member
    ROA Member# 12258
    GSCA Member# 1176
    AACA Member# 993257

  10. #85
    EEE's Avatar
    EEE is offline Straight out of lo-cash!
    Join Date
    May 2004
    Location
    Hollywood
    Posts
    4,017

    Default Re: 9 3/8" rear differences

    Anyone knows if a 66 LeSabre comes with the 9 3/8, or does that have a smaller diameter differential?
    Kimson
    1966 Wildcat


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



  11. #86

    Default Re: 9 3/8" rear differences

    I would imagine that it comes with the smaller rear, as the 66 LeSabre wasn't offered with the "big engine". Although, I have no idea what would be in a 66 LeSabre to begin with
    Adam Martin
    BPG# 1358
    BCA# 39765
    1970 Buick Skylark Custom 455 Coupe
    www.antiqueautomotiveservice.com

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

  12. #87
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,246

    Default Re: 9 3/8" rear differences

    I do know that the '67 LeSabre is NOT a 9-3/8", but someone with a '66 chassis manual will have to chime in.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  13. #88
    Join Date
    Oct 2009
    Location
    CUYAHOGA FALLS,OHIO
    Posts
    12

    Default Re: 9 3/8" rear differences

    Just found V8BUICK site. This is my first try.

    Need info for my 76 Buick Estate Wagon. Setting it up to tow a Travel Trailer.

    Engine was set up with RV cam, flat top pistons, .030 over, engine oil cooler remote oil filter, 4 core radiator, additional electrial fans and 2-1/4" dual exhaust.

    Power is sent thru a 700R4 transmission with an oil cooler and remote filter. The better gearing helps. Still difficult to climb hills in 3rd. Can't make full use of the 4th gear OD on the flat.

    Installed a 1972 Buick Estate Wagon 12 bolt, 9.375 ring gear differential with 2.93 gears. Original diff was a 10 bolt 2.93 gears but the axle bearings were going. The 72 housing, brakes and bearings are massive. Installed brake shoes. wheel cylinders, lines, axle bearings and seals. Scales show 3760# on the rear wheels with TT hitched up with stabilizer bars. Want to keep it.

    Need info on 9.375, 3.23 and 3.42 gears, or better. that wil fit. Willing to buy the entire differential for the carrier if needed.

    76WAGON

  14. #89
    Join Date
    May 2003
    Location
    I-95, Old exit #69 ;]
    Posts
    5,309

    Default Re: 9 3/8" rear differences

    you should start a new thread in the "Parts Wanted" section.

  15. #90
    Join Date
    Nov 2003
    Location
    Richfield , Ohio
    Posts
    2,615

    Default Re: 9 3/8" rear differences

    Does any one know the length of the uppoer control arm length from bolt hole center to bolt hole center and maybe a pictures of one would be great. Thanks, jim

  16. #91
    Join Date
    May 2003
    Location
    I-95, Old exit #69 ;]
    Posts
    5,309

    Default Re: 9 3/8" rear differences

    sorry i took so long, Jim.

    here you go:




    arm is 11" from center to center. it's 2 7/8" wide on the inside of the wide end, 1 3/16" wide at the end that gets the bushing. 3 1/2" tall on the bushing end, 2 3/4" tall at the wide end.

  17. #92
    Join Date
    May 2003
    Location
    I-95, Old exit #69 ;]
    Posts
    5,309

    Default Re: 9 3/8" rear differences

    looks like Mr. Cull's lower arm fabrication idea would work for us too:
    http://www.teambuick.com/forums/view..._trailing_arms

  18. #93
    Join Date
    Sep 2010
    Posts
    48

    Default Re: 9 3/8" rear differences

    How many bolts on the Non Posi 67 Riviera carrier that bolt on the ring gear.Anyone know the standars rear end config.Can i put a Posi in it or is a conversion doable like a 70-76 Impala complete rear end conversion.Baiscally i want my standard 67 Riviera rear end to be a Posi.Using same or different gears.

  19. #94
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,246

    Default Re: 9 3/8" rear differences

    Quote Originally Posted by funkyman View Post
    How many bolts on the Non Posi 67 Riviera carrier that bolt on the ring gear.Anyone know the standars rear end config.Can i put a Posi in it or is a conversion doable like a 70-76 Impala complete rear end conversion.Baiscally i want my standard 67 Riviera rear end to be a Posi.Using same or different gears.
    I know of nothing that will work short of either finding a '67-'70 posi carrier, or having a complete custom rear end assembly fabricated using a more modern & popular center section.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  20. #95
    Join Date
    Sep 2010
    Posts
    48

    Default Re: 9 3/8" rear differences

    Any ideas with brand new complete rear end assembley that will fit my 67 Riv.E.g Moser engineering.Any rear ends that fit a 67-68 Riviera?

  21. #96
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,246

    Default Re: 9 3/8" rear differences

    Quote Originally Posted by funkyman View Post
    Any ideas with brand new complete rear end assembley that will fit my 67 Riv.E.g Moser engineering.Any rear ends that fit a 67-68 Riviera?
    No, there are no aftermarket assemblies "off the shelf". It would have to be built for you, probably using your existing housing as a guide and possibly parts donor.

    You have to realize that your Riv rear housing is very much an oddball because of the X frame. You have two lower trailing arms, only one upper plus a panhard bar.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  22. #97
    Join Date
    Sep 2010
    Posts
    48

    Default Re: 9 3/8" rear differences

    You know this is all way too much information, or sophisticated for me to fathom all at once.All i want is a Posi rear on my 67 Riviera.What do i need for heaven sakes.Someone selling a 66-70 rear posi? and will my gears fit?.Tell me what i need and i`ll go and seek it.I need help.

  23. #98
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,246

    Default Re: 9 3/8" rear differences

    First you need to know exactly what you want, because believe it or not, knowing you want a posi carrier isn't enough info. You first need to find out what your current rear axle gear ratio is.

    If you have a 2.78:1 or 3.07:1 gearset, you need a posi carrier from a 1967-1970 Wildcat, Electra or Riviera that also carries 2.78:1 or 3.07:1. If your Riv currently has a 3.42:1 or 3.91:1 gearset, you'll have to find a posi carrier that had those ratios instead.

    In other words, you can't run a set of 3.07:1 gears on a carrier built to handle 3.42:1 & up. Make sense?

    Next, when you know which carrier you need, post in Parts Wanted.

    Then wait.

    Then buy one when it shows itself.

    Then take the car with your new carrier to a good shop that can set it up with your old gears. It's not necessarily a job for a novice.

    Devon
    Last edited by DaWildcat; 11-06-2010 at 10:39 AM.
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  24. #99
    Join Date
    Aug 2003
    Location
    wisconsin
    Posts
    183

    Default Re: 9 3/8" rear differences

    Quote Originally Posted by telriv View Post
    The best question that hasn't been asked, will the ring gears fit the other type carriers??? Yes, they are all 9 3/8ths. Will older gears fit (up to '70) on '71-'75 carriers??? Yes, again, they are 9 3/8ths also. Can older gears be installed in newer ('71-'75) carriers??? Yes, with some minor modifications & using an older pinion seal. Some of the differences are ring gear bolts. Older are right hand threads, newer are left hand threads. Try swapping around gears only & not full carriers & more can & will be learned. 3.23 & down uses one carrier & 3.42 & up use another. The 3.23 carrier can be used with 3.42 gears with an approx. 1/4" spacer & longer ring gear bolts. Ed & I did this 3 years ago & proved to our satifaction it can be done. I believe he has finally done this on his '73??? Riv. GS by installing older 3.90's in his rear housing.
    Good info here, as I believe Jim(Monzaz) has a older set of the 3.42 gears for sale on here, put them in my rear(71-76) i have for sale and u have a nice 3.42 rear!
    grandville464
    2010- 11.64 E.T- Best Mph 115.07- 60ft 1.63
    2011- 11.501 E.T 117.74 MPH 1.62 60 ft- 4550 pds

  25. #100
    Join Date
    Sep 2010
    Posts
    48

    Default Re: 9 3/8" rear differences

    I have yet to find out what rear i have.I need to go to a shop and have it looked into:-)I do however think that it is a standard rear with a standard gear ratio of that year,so whatever was offered as standard.

 

 
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