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Thread: change to posi

  1. #1
    Join Date
    Jan 2013
    Location
    Ma.
    Posts
    41

    Default change to posi

    Looking for some tech info.... This is the place ! I'm looking at a 70 gs 350 with a peg leg. I know the 68-70 posi rear ends are specific Buick gs only and not a BOP. Is the housing on the peg leg the same as the posi ? ( 2 different size bearings , axle spline and diameter etc... ) ... Thanks Jim

  2. #2
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,208

    Default Re: change to posi

    http://www.jdrace.com/diff_id/10bBOP_Buick.htm

    The above is the site of V8 member Monzaz He can advise you best about a posi carrier for the 68-70 buick 8.2 10 bolt.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  3. #3
    Join Date
    Aug 2009
    Location
    Erie,Pennsylvania
    Posts
    571

    Default Re: change to posi

    Yes,the axle housings are the same for posi & non-posi. Fabcraft makes 3:42 & 3:64 gears for them. They also sell a modified Auburn posi unit,but I modify an Eaton.
    Brian Trick
    thetrickfamily@yahoo.com
    814-440-3553

    70 Cutlass W31
    70 442 W30 4-spd
    71 442 W30 4-spd
    72 Cutlass Supreme 507"
    70 Buick GS 455

  4. #4
    Join Date
    Nov 2003
    Location
    Richfield , Ohio
    Posts
    2,593

    Default Re: change to posi

    Quote Originally Posted by 70gsjim View Post
    Looking for some tech info.... This is the place ! I'm looking at a 70 gs 350 with a peg leg. I know the 68-70 posi rear ends are specific Buick gs only and not a BOP. Is the housing on the peg leg the same as the posi ? ( 2 different size bearings , axle spline and diameter etc... ) ... Thanks Jim

    68 69 will have the RW507GR BEARINGS IN THE AXLES where as the 1970 will have the set9/ A9 oiled axle bearing system. If you have a 68 69 GS housing really double think before you remove your axle bearings and find the GR bearing before you start your build.

    The 68 69 70 will all have the same bearings and parts that will interchange
    1 series -2.56
    2 series - 2.73 2.93 (have posi units in after market)
    3 series - 3.23 3.42 (have posi units in the aftermarket) Fab craft gears fit this carrier (3.42 and 3.64 ratios)
    4 series - 3.64 - 5.00 ( we can make a posi unit custom for this steeper series)


    Jim
    J D

  5. #5
    Join Date
    Aug 2009
    Location
    Erie,Pennsylvania
    Posts
    571

    Default Re: change to posi

    I have a supply of the odd GR bearings,if needed.
    Brian Trick
    thetrickfamily@yahoo.com
    814-440-3553

    70 Cutlass W31
    70 442 W30 4-spd
    71 442 W30 4-spd
    72 Cutlass Supreme 507"
    70 Buick GS 455

  6. #6
    Join Date
    Nov 2003
    Location
    Richfield , Ohio
    Posts
    2,593

    Default Re: change to posi

    With or with out retaining rings?

  7. #7
    Join Date
    Aug 2009
    Location
    Erie,Pennsylvania
    Posts
    571

    Default Re: change to posi

    The ones I have now have the retaining rings.
    Brian Trick
    thetrickfamily@yahoo.com
    814-440-3553

    70 Cutlass W31
    70 442 W30 4-spd
    71 442 W30 4-spd
    72 Cutlass Supreme 507"
    70 Buick GS 455

  8. #8
    Join Date
    Nov 2003
    Location
    Richfield , Ohio
    Posts
    2,593

    Default Re: change to posi

    Quote Originally Posted by BrianTrick View Post
    The ones I have now have the retaining rings.
    Why are you not advertising them? tons of guys here could use them...???

  9. #9
    Join Date
    Aug 2009
    Location
    Erie,Pennsylvania
    Posts
    571

    Default Re: change to posi

    I did awhile back,and I have mentioned it in a few other posts. They sell occasionally.
    Brian Trick
    thetrickfamily@yahoo.com
    814-440-3553

    70 Cutlass W31
    70 442 W30 4-spd
    71 442 W30 4-spd
    72 Cutlass Supreme 507"
    70 Buick GS 455

 

 

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