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TH400...who running one? pros & cons? doubler?

Discussion in 'The Garage' started by yunit, Jul 3, 2002.

  1. yunit

    yunit 1/2 ton status

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    I just found out that my cousins friend is a tranny wiz and I can get a really good deal on a rebuild. Give me the low down on the tranny, links, articles, thoughts, kits, available gearing, etc...

    Who is running this in a doubler setup too?
     
  2. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i don't know about kits but i know i like my th400, it's peace of mind, i know my trannie is gonna be the last thing to break.
     
  3. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    Got 2 of them for sale. Check the For Sale board.
     
  4. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i think shift kits are more expensive for the 400 than the 350.
     
  5. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Tell your cousin you want the following stuff for the 400:

    1) TH475 straight-cut planetary gears. These are a straight cut unlike the TH400 which has angled cut planetaries. The straight-cut ones are way stronger than the angled cuts. A simple swap if you can find the planetary.

    2) Get an aftermarket low-gear planetary kit. This kit will give you a lower first and second gear ratios.

    3) Get the HD version K-case. This is the 4x4 tranny housing that will use the thick aluminum 6-bolt dust cover for the flywheel/torque convertor.

    4) Make sure to get the proper output shaft for the t-case you have in mind. There are 3 different lengths of output shafts for the GM line of t-cases.

    5) Get an aftermarket aluminum deep pan, like from TCI, or B&M, etc. These will give you approximately 2 extra quarts of ATF. The aluminum helps cool the fluid better, too.
     

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