89 c2500 TH400 rebuild or replace???

Discussion in 'Transmissions' started by tardisguy, Apr 7, 2021.

  1. stutaeng

    stutaeng I'm Awesome

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    I thought the regular pickup trucks got a standard TH400/3L80. Wasn't there also a 3L80HD(TH475)? I thought those were only installed on motor homes? I think they have a brake mechanism on the tailhousing. I don't know what the difference would be, maybe straight cut gears?

    I was reading a few threads on the Jaguar forums, and some of those guys are very knowledgeable on the TH400/4L80e. Maybe do some reading over there. Performancetruck.net has a lot of information on the subject as well.
     
  2. Erik the Awful

    Erik the Awful Supporting Member

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    Bobby
    You'll want to look in the XJS / XJ12 sections because the TH400 was only offered in the 12 cylinder Jags. The six-cylinder XK motors got a Borg Warner BW55.
     
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  3. Schurkey

    Schurkey I'm Awesome

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    Modulator
    Governor
    Plugged trans filter
    Sticking valves in valve body
    Kickdown solenoid/Kickdown switch
    "something very weird"
     
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  4. tardisguy

    tardisguy Newbie

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  5. Erik the Awful

    Erik the Awful Supporting Member

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    I think you have the album set as private. It won't let me see the pics.
     
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  6. tardisguy

    tardisguy Newbie

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    I fixed it
     
  7. tardisguy

    tardisguy Newbie

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    Got the original TH400 that was in the truck this weekend. Have not had a chance to do any teardowns or much else. Still waiting on my book and getting ready to go to Talladega this weekend for the NASCAR race. Scratch that off the bucket list!
     
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  8. stutaeng

    stutaeng I'm Awesome

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    Awesome! I have acquired 2 spare, junkyard 4L80e trannies, a late and an early model. I'm thinking of taking the plunge and overhauling them myself. Mainly as a personal challenge (but also to save some $$$). I've got a lot of projects half-started, but this is how I roll, LOL.

    Except for the foot press, seems like tools needed to overhaul them are just basic tools that most certainly I already have.

    What book did you buy?
     
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  9. tardisguy

    tardisguy Newbie

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    Cliff Ruggles TH400 book
     
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  10. Erik the Awful

    Erik the Awful Supporting Member

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    I used my harbor freight press and some bent flat plate when rebuilding my 700R4.
     
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