Got gears?

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

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  1. matt68gs400

    Eaton Posi

    matt68gs400, Sep 19, 2015 ... 2
    Replies:
    33
    Views:
    4,161
    matt68gs400
    Jun 6, 2016
  2. jay3000

    Help me with traction. Will a powertrax locker work???

    jay3000, Dec 3, 2007 ... 2
    Replies:
    33
    Views:
    4,143
    monzaz
    Dec 20, 2008
  3. GRIMM

    Axle Conversion

    GRIMM, Jun 14, 2006 ... 2
    Replies:
    33
    Views:
    1,769
    GRIMM
    Jul 9, 2006
  4. buickmanmarty

    3.91 vs 2.93

    buickmanmarty, Feb 3, 2023 ... 2
    Replies:
    32
    Views:
    1,263
    bobc455
    Feb 9, 2023
  5. 66electrafied

    Driveline vibration tough to source

    66electrafied, Aug 15, 2017 ... 2
    Replies:
    32
    Views:
    1,762
    Ryanjbill15
    Jul 14, 2018
  6. TXGS

    410 gears on the Street

    TXGS, Mar 9, 2005 ... 2
    Replies:
    32
    Views:
    3,513
    MR.BUICK
    Mar 11, 2005
  7. uwjberg

    Help with Rear End ID

    uwjberg, Jun 10, 2022 ... 2
    Replies:
    31
    Views:
    931
    Max Damage
    Mar 1, 2023
  8. mikethegoon

    12 bolt preload springs R/r

    mikethegoon, Mar 8, 2021 ... 2
    Replies:
    31
    Views:
    1,639
    BrianTrick
    Apr 6, 2021
  9. Gtivalencia34

    What modern rear end is comprable to my 72 Skylark ( I need help plz)

    Gtivalencia34, Jun 9, 2019 ... 2
    Replies:
    31
    Views:
    2,120
    12lives
    Jun 12, 2019
  10. Dr. Roger

    Replacing pinion bearings on 8.5 diff

    Dr. Roger, Jan 25, 2019 ... 2
    Replies:
    31
    Views:
    1,344
    monzaz
    Feb 4, 2019
  11. Nick 66 Skylark

    WTB posi rear end

    Nick 66 Skylark, Dec 23, 2022 ... 2
    Replies:
    30
    Views:
    961
    monzaz
    Dec 29, 2022
  12. GMMADMAN

    Ring/pinion set up question

    GMMADMAN, Apr 15, 2018 ... 2
    Replies:
    30
    Views:
    1,344
    GMMADMAN
    May 15, 2018
  13. BWINN519

    Will it fit ? 10 bolt posi question

    BWINN519, Mar 31, 2012 ... 2
    Replies:
    30
    Views:
    3,912
    LARRY70GS
    Jun 12, 2014
  14. lemmy-67

    driveshaft/ST400 noise?

    lemmy-67, Feb 22, 2013 ... 2
    Replies:
    30
    Views:
    3,466
    lemmy-67
    Jul 22, 2013
  15. fastd

    Posi Swap 3.07 for 3.42 '67 Riviera

    fastd, Jan 21, 2012 ... 2
    Replies:
    30
    Views:
    3,927
    fastd
    Mar 21, 2012
  16. Topless64-455

    THoughts on running 3.31 gear with a 200r4 tranny???

    Topless64-455, Apr 23, 2011 ... 2
    Replies:
    30
    Views:
    4,240
    LowFlyLark
    May 5, 2011
  17. garybuick

    700 R4 with Gear Vendor Overdrive

    garybuick, Aug 24, 2007 ... 2
    Replies:
    30
    Views:
    3,085
    nekkidhillbilly
    Sep 22, 2007
  18. jtcasper

    67 Riviera GS bent rear control arm

    jtcasper, Jan 29, 2007 ... 2
    Replies:
    30
    Views:
    3,954
    jtcasper
    May 20, 2007
  19. rkammer

    Change 8.5 rear end ratio from 3.42 to 3.73 or 3.91

    rkammer, Jan 26, 2023 ... 2
    Replies:
    29
    Views:
    968
    rkammer
    Jan 28, 2023
  20. Luxus

    What rear do I have?

    Luxus, Feb 18, 2020 ... 2
    Replies:
    29
    Views:
    1,231
    Bigpig455
    Mar 3, 2020
  21. schwemf

    Wheel Bearings for 1970 GS 3.64 RW507G

    schwemf, Jul 24, 2016 ... 2
    Replies:
    29
    Views:
    4,302
    CruisinLou
    Feb 23, 2020
  22. hgiljr

    Gears to go with

    hgiljr, Sep 9, 2019 ... 2
    Replies:
    29
    Views:
    1,450
    Gary Bohannon
    Dec 11, 2019
  23. Christopher Spouse Drew

    8.5 10 Bolt Rear End Questions

    Christopher Spouse Drew, Jun 26, 2018 ... 2
    Replies:
    29
    Views:
    1,473
    TexasT
    Jun 29, 2018
  24. mummy68

    Is this too much Gear for my application. Street Car

    mummy68, Nov 15, 2017 ... 2
    Replies:
    29
    Views:
    2,331
    Mart
    Jan 7, 2018
  25. Romel

    8.5 Rearend Gear Interchange Issue

    Romel, Sep 25, 2017 ... 2
    Replies:
    29
    Views:
    1,856
    monzaz
    Oct 3, 2017
  26. afracer

    Help identify this rear end! 12 bolt

    afracer, Jun 4, 2016 ... 2
    Replies:
    29
    Views:
    6,695
    monzaz
    Jun 9, 2016
  27. afracer

    How to tell an original 4 speed car?

    afracer, Dec 12, 2015 ... 2
    Replies:
    29
    Views:
    3,121
    Chris Lott
    Dec 15, 2015
  28. yamaharx-1

    What is a 10 bolt worth?

    yamaharx-1, Nov 10, 2011 ... 2
    Replies:
    29
    Views:
    6,453
    Nothingface5384
    Apr 4, 2014
  29. PatricksBuick

    Rear axle decided to leave...... Scary!!!

    PatricksBuick, Apr 15, 2013 ... 2
    Replies:
    29
    Views:
    3,401
    PatricksBuick
    Apr 26, 2013
  30. 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:
    7,424
    USAMPFREAK
    May 5, 2009
  31. Troys69GS

    Everything you wanted to know about diffs

    Troys69GS, Mar 15, 2008 ... 2
    Replies:
    29
    Views:
    2,714
    nekkidhillbilly
    Apr 23, 2008
  32. kick71

    8.5 "ON" code rear ?

    kick71, Nov 26, 2007 ... 2
    Replies:
    29
    Views:
    3,331
    copperheadgs1
    Dec 27, 2007
  33. Buickcub

    8.5 10 bolt suggestions

    Buickcub, Jan 12, 2021 ... 2
    Replies:
    28
    Views:
    1,458
    monzaz
    Jun 21, 2021
  34. JoRion

    3.08 vs 3.23 with Muncie m20

    JoRion, Oct 26, 2020 ... 2
    Replies:
    28
    Views:
    1,929
    JoRion
    Oct 29, 2020
  35. GMMADMAN

    rear end swap

    GMMADMAN, Feb 26, 2018 ... 2
    Replies:
    28
    Views:
    3,068
    monzaz
    Jun 19, 2019
  36. Ryanjbill15

    72 Skylark rear gears chewed up- HELP PLEASE

    Ryanjbill15, Jul 2, 2018 ... 2
    Replies:
    28
    Views:
    1,188
    BrianTrick
    Jul 11, 2018
  37. online170

    Really strange failure, your thoughts? Trying to make sure it doesnt happen again

    online170, Dec 15, 2010 ... 2
    Replies:
    28
    Views:
    2,324
    26Troadster
    Jan 3, 2011
  38. Sabotage_666

    Western PA. Where can I find a 12 bolt?

    Sabotage_666, Dec 21, 2010 ... 2
    Replies:
    28
    Views:
    2,311
    LKBUMM
    Dec 23, 2010
  39. wakewil

    rear end newb.

    wakewil, Dec 11, 2009 ... 2
    Replies:
    28
    Views:
    2,032
    BWINN519
    Dec 24, 2009
  40. tt455

    going from 8.5 to 8.2 ?

    tt455, Feb 7, 2007 ... 2
    Replies:
    28
    Views:
    6,687
    tt455
    Feb 13, 2007
  41. rh455

    Rear axle opinions

    rh455, Oct 24, 2005 ... 2
    Replies:
    28
    Views:
    2,654
    sbbuick
    Oct 28, 2005
  42. Ryanjbill15

    New gears and posi noise on tight turns

    Ryanjbill15, Jul 15, 2018 ... 2
    Replies:
    27
    Views:
    6,396
    UPSTAGED1970
    Jul 18, 2018
  43. 70skylark350

    stupid brake question. help me!!!!

    70skylark350, Mar 27, 2018 ... 2
    Replies:
    27
    Views:
    1,641
    bostoncat68
    May 9, 2018
  44. BrianTrick

    3:55 ARE available for the 8.5" 10-bolt

    BrianTrick, Aug 28, 2017 ... 2
    Replies:
    27
    Views:
    1,741
    monzaz
    Sep 6, 2017
  45. Bill9066

    1967 Chevelle Rear Axle Installed In a 1972 455 GS

    Bill9066, Oct 6, 2016 ... 2
    Replies:
    27
    Views:
    2,967
    Gary Bohannon
    Oct 22, 2016
  46. Robs455

    Ring and pinion gear pattern

    Robs455, Mar 7, 2015 ... 2
    Replies:
    27
    Views:
    8,248
    Robs455
    May 27, 2016
  47. SpecialWagon65

    2.56 :1 posi?

    SpecialWagon65, Oct 26, 2013 ... 2
    Replies:
    27
    Views:
    4,668
    BrianTrick
    May 13, 2015
  48. LOSABRE59

    '59 buick rear end question

    LOSABRE59, Nov 19, 2009 ... 2
    Replies:
    27
    Views:
    4,109
    monzaz
    Apr 13, 2013
  49. eagleguy

    Gear ratio question

    eagleguy, Oct 5, 2012 ... 2
    Replies:
    27
    Views:
    4,397
    eagleguy
    Oct 11, 2012
  50. f16dcc431

    power trax

    f16dcc431, Apr 7, 2012 ... 2
    Replies:
    27
    Views:
    2,529
    69GS400s
    Apr 13, 2012
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