turbo 400 overhaul question
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turbo 400 overhaul question

  1. #1
    Senior Member Reservoir Dog's Avatar
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    Default turbo 400 overhaul question

    so I've watched a couple of YouTube videos but have not slept at a holliday inn express yet.

    How hard is it to rebuild a th400 transmission? I've built several engine but never have I done an automatic transmission. Is there a good manual to get for this, if I decide to do this myself?

    The reason I ask is I just picked up a new project, a 21ft 1980 hallett mini day cruiser, got a th400 from a friend. There is no histstory on trans, so I figure it will need to be rebuilt. I've been on tci's web site found there pro race kit that comes with rebestos clutches and steels, Kevlar bands, all bushings, gaskets, and seals. Or should I just take it to a shop?

    Thanks trevor

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    Senior Member ol guy's Avatar
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    In a cruiser you are going to want a reverse valve body and there are certain arts to build it proper. If you do it as a carry in It wont be as spendy as a drive in. I have a eliminator cruise and it was by B&M . Not to mention you toss the converter and use a torque plate which I think requires a different front seal. I would say better safe than sorry and have somebody "in the know" do it. MLAO Mark

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    Senior Member Sleek Freak's Avatar
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    I'd call Art Carr. the man knows his stuff and likes talking about v drive transmissions.

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    I have built many, there isn't much too it. You are going to need a reverse manual valve body and TCI is not the place to go for this in my opinion. I like the design of the turbo action (cheetah), easy to read and install. Like anything else it goes back together like it comes apart so if you take your time you will get done and wonder why you have not done it before. The book is learned from and always use is the ron sessions th400 book. Not sure how much power your making but a few upgrades would probably be in line, let me know if I can add anything to help you out.

  7. #5
    Highaboosta Unchained's Avatar
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    Before you invest any more in the TH400 take a good look at a powerglide.
    Smaller, Lighter and stronger.

    I switched and like the PG better.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

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    I think I could run more boost but it's a real hand full right now

  8. #6
    Senior Member Sleek Freak's Avatar
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    X2 on the glide.

  9. #7
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    Sorry I meant to say I was looking at the Hughes kit. I talked to a couple of friends a bout the glide , but they said I would be better of with a 400. 1st for marina, 2nd for skiing, drive for cruising. The glide would not work out well for skiing.

    power wise I have a 427 w/ 8-71 @ 10-12 psi, thinking in the neighborhood of around 550-650hp

  10. #8
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    Glides have their place, but the stock th400 hard parts for the most part will take more abuse. All you really need at that power level is a good rebuild kit, a manual valve body, and a smooth direct drum with a 34 element sprag, all can be purchased for not a ton of money. Look at Jakes transmission's website, killer rebuild kit, and drum and sprag available.

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