Got gears?

Too much gear? Not enough? Discuss all your rear end and driveshaft questions here.

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  1. GRIMM

    9", or 12 Bolt?

    GRIMM, Aug 28, 2006 ... 2
    Replies:
    35
    Views:
    6,820
    monzaz
    Mar 16, 2010
  2. PCUB

    Differential Fluid Change?

    PCUB, Aug 20, 2015 ... 2
    Replies:
    21
    Views:
    6,822
    matt68gs400
    Sep 20, 2015
  3. afracer

    Help identify this rear end! 12 bolt

    afracer, Jun 4, 2016 ... 2
    Replies:
    29
    Views:
    6,838
    monzaz
    Jun 9, 2016
  4. Christopher Spouse Drew

    Finding a 10 bolt 8.5 posi In salvage yards

    Christopher Spouse Drew, Dec 15, 2018 ... 2 3
    Replies:
    56
    Views:
    6,934
    BrianTrick
    Jan 30, 2019
  5. landshark

    67 GS axle Bearings

    landshark, Nov 18, 2005 ... 2
    Replies:
    23
    Views:
    7,120
    diver
    Dec 9, 2005
  6. techg8

    Opinions on 3.08 vs 3.23 vs 3.42 rear ratios?

    techg8, Aug 23, 2008
    Replies:
    12
    Views:
    7,283
    Nothingface5384
    Aug 24, 2008
  7. MartinNr5

    How do I remove my C-clips? (Posi rear end)

    MartinNr5, Apr 29, 2010
    Replies:
    12
    Views:
    7,317
    JZRIV
    May 7, 2010
  8. Pandoraskeeper

    Rear End on a '72 Buick Skylark?

    Pandoraskeeper, Apr 1, 2008
    Replies:
    5
    Views:
    7,389
    GStage1
    Apr 7, 2008
  9. buicks

    Not enough gear

    buicks, May 1, 2015 ... 2 3 4
    Replies:
    61
    Views:
    7,457
    buicks
    Jul 16, 2015
  10. monzaz

    10 bolt 68-70 posi units for the high gears 2.56 2.73 2.93

    monzaz, Dec 16, 2008 ... 2
    Replies:
    29
    Views:
    7,483
    USAMPFREAK
    May 5, 2009
  11. mkeeler

    What rear end to use ?

    mkeeler, Feb 15, 2011 ... 2
    Replies:
    25
    Views:
    7,725
    monzaz
    May 22, 2019
  12. 68custom

    1968 rear end?

    68custom, Oct 12, 2011 ... 2
    Replies:
    22
    Views:
    7,746
    OhioGS400
    Oct 23, 2011
  13. rack-attack

    12 bolt type 0

    rack-attack, Oct 21, 2009 ... 2
    Replies:
    25
    Views:
    7,754
    stage1 Rick
    Nov 20, 2009
  14. Sabotage_666

    auburn limited slip vs. eaton posi

    Sabotage_666, Feb 23, 2011
    Replies:
    10
    Views:
    7,908
    Sabotage_666
    Feb 23, 2011
  15. Msharkf2

    Strength of 8.5" Grand National Rear

    Msharkf2, Jan 21, 2016 ... 2
    Replies:
    21
    Views:
    8,058
    bobbybuick
    Feb 23, 2016
  16. Robs455

    Ring and pinion gear pattern

    Robs455, Mar 7, 2015 ... 2
    Replies:
    27
    Views:
    8,330
    Robs455
    May 27, 2016
  17. Ken Mild

    Installing gears and posi at home - 12 bolt

    Ken Mild, Feb 21, 2011
    Replies:
    17
    Views:
    8,420
    matt68gs400
    Oct 6, 2015
  18. DLG

    8.5 rear conversion for a g-body

    DLG, Apr 4, 2007
    Replies:
    10
    Views:
    8,447
    oPh
    Apr 11, 2007
  19. Conner

    POSI Options for 64' Skylark???

    Conner, Sep 22, 2009 ... 2
    Replies:
    27
    Views:
    8,492
    sd-slider
    Aug 1, 2010
  20. Horsman

    8.5 rear end identification?

    Horsman, Aug 23, 2006
    Replies:
    17
    Views:
    8,763
    Running
    Aug 27, 2006
  21. fireball

    67 GS 400 rear axle seal question

    fireball, Jun 7, 2008 ... 2
    Replies:
    25
    Views:
    8,777
    wkillgs
    Jun 27, 2008
  22. cellblock_g

    1985 Buick Le Sabre rear axle ratio

    cellblock_g, Nov 13, 2009 ... 2
    Replies:
    25
    Views:
    9,390
    cellblock_g
    Aug 13, 2010
  23. 66rivnail

    Any opinions on National vs. Timken bearings?

    66rivnail, Apr 25, 2010
    Replies:
    4
    Views:
    10,806
    66rivnail
    Apr 26, 2010
  24. 70aqua_custom

    Factory Buick Rear Differentials, What Were They Thinking?

    70aqua_custom, Dec 8, 2015 ... 2
    Replies:
    22
    Views:
    11,678
    monzaz
    Dec 17, 2015
  25. matt68gs400

    Gear ratio, wheel size, and TH400

    matt68gs400, Aug 31, 2015 ... 4 5 6
    Replies:
    106
    Views:
    13,259
    matt68gs400
    Oct 2, 2016
  26. jmccart

    8.5 10 bolts, 71 & later Buick & Olds, Pontiac too?

    jmccart, Aug 19, 2009 ... 2
    Replies:
    33
    Views:
    17,485
    Bens99gtp
    Jul 7, 2021
  27. 70Sabre

    Buick Rear End Info

    70Sabre, Feb 9, 2008 ... 2
    Replies:
    26
    Views:
    45,508
    PatrickSkylark
    Jan 14, 2021
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