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3 spd t-case

Discussion in '40- & 55-Series Tech' started by northernfj40, Dec 30, 2002.

  1. northernfj40

    northernfj40

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    ::)68 3 spd t-case, are they a weak link or not? I'm also looking for the low range ratio of this t-case.
     
  2. woody

    woody Internet Fireman Staff Member

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    the case material is more brittle than other years, so yes it is not one of the stronger models. low range is 2.313.

    If you aren't running a warmed smallblock V8, you likely won't have a problem....IMO, run a Dan Amway t-case saver - I bought mine from him on E-Bay.
     
  3. northernfj40

    northernfj40

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    Thanks for the infomation. This Dan Amway t-casse saver is there a web pape or # to contate for more imfo. I have run toy mini trucks all my life, and picked up a 68 fj-40 to restore. I'm just checking out oppions.L/C parts are hard to come by in norther alberta canada.
     
  4. woody

    woody Internet Fireman Staff Member

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  5. Vortec_Cruiser

    Vortec_Cruiser

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    When I installed a 3-spd xfer case in my Cruiser (behind a Chevy 5.7L Vortec and SM465), I put the 3-spd internals into my 1977 4-spd xfer case housing. It's a stronger housing than the 1969 3-spd housing. I also added a stiffener that I got from Don Anway.

    Ed Gilbert - TLCA #5659 ::)
     
  6. PHAT MAX

    PHAT MAX

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    if you do that, you still have the ten spline input gear and can use an adapter meant for a three speed case, right?

    i wanted to do this, how hard is it?
     
  7. woody

    woody Internet Fireman Staff Member

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    Max, you can't hardly tell the difference between a 3-speed and 4-speed case...they bolt up identically, and most parts interchange.

    You pretty much rebuild a 4-speed case using 3-speed gears and a wider shim for the idler cluster. Cory has done it - piece of cake.
     
  8. PHAT MAX

    PHAT MAX

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    awww crap! I have the rebuild kit for the three speed! :mad:

    i will think about it, maybe my 4-speed case wont need a rebuild.

    (the reason i am putting in a three speed is because that is the adapter the guy had...otherwise i would have used my 4speed case) maybe i can put the three speed gears in there (and bearings) and have the best of both worlds!

    nebody know if the bearings will work?
     
  9. woody

    woody Internet Fireman Staff Member

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    same bearings - no difference that I'm aware of...well....mostly...the support bearing for the tranny output might be different, but talk nice and I can looksee if I have one laying around....

    heh heh...it will be obvious what bearings aren't the same when you start to rebuild it... :D
     
  10. northernfj40

    northernfj40

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    I'm about to start my t-case tare down. The driven gear in the pto is pretty beat up any takers on replacment parts? Also any ideas on arebuild manual for the t0-case? I have a GRB np203 for the front of the 3spd case will it be strong enouph?