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Th400 swap

Discussion in 'The Garage' started by towdriver80, Feb 8, 2005.

  1. towdriver80

    towdriver80 Registered Member

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    Hi, Ive got a 79 k5. Blew out the front seal on the tranny(th350) bogging yesterday. I have a th400/np203 combo laying around and wondered if it would be a direct swap, or if I would have to make any driveshaft length changes? This th400 has an electric kickdown instead of a cable, any one know if it needs a ground or +12v signal? Any help would be really appreciated. I dont want to waste time dropping and repairing the 350 if the 400 would fit. The engines pushing over 400 horse, and its sitting on 39.5`s, I think its only a matter of time before something more serious blows on the 350.
     
  2. boz42

    boz42 1/2 ton status GMOTM Winner

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    d-shafts will change for sure. frt will be longer rear will be shorter. 12 volt signal for switch irc.
     
  3. towdriver80

    towdriver80 Registered Member

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    Thank you. I Think I will measure the new lengths and go junkyard hopping. I really want to get that th400 in there.
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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    fill in your profile and location stuff. i live in ny state and might be able to help you.
     
  5. RustBuket

    RustBuket 1/2 ton status

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    Just a thought.... I have no idea if you could this or not but maybe you could hook the elec kick down as normal but u could have a little thumb switch on the wheel or something for those times when she just doesn't kick down when you want.... ?
     
  6. towdriver80

    towdriver80 Registered Member

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    Thanks again for the help. I had the front driveshaft from the one ton truck I scavenged the tranny and t-case out of, and it measures up o.k. The machine shop in my town said they could cut the rear shorter for me for $50. Im going to put the tranny in and recheck all the measurements `cause its hard to cut a driveshaft longer.:weld: I spent too much on the 39" boggers(15 inch rim), So I dont want to put in the one ton axles(16.5" rim) until I`m ready for the next set of tires. Can I find a custom U-joint that will let me use one ton driveshafts with the 12 bolt axles? I`m not good with computers, where do I click to edit the profile stuff you were talking about?
     
  7. sweetk30

    sweetk30 professional hooker Premium Member

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    go to napa or do a serch in here under ujoints. there was a chart posted a few weeks ago with # on it.


    thanks for the profile info. now i can see how close you are to me. good luck.
     
  8. sweetk30

    sweetk30 professional hooker Premium Member

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    just checked and there is a member in your county. and we are going to do a gettogether in late spring or summer. more details in the reginal form. its all there . hope to see you .
     
  9. towdriver80

    towdriver80 Registered Member

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    Sounds like fun. Will NY state troopers really let more than two k5`s assemble in one spot?:grin:
     
  10. sweetk30

    sweetk30 professional hooker Premium Member

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    hahaha funny. we just had a poker run up here and the sherrifs were giving out tickets and the troppers showed up and kicked there a$$es out and told them to go to hell. thay didnt relize how much money we bring in to the small town every 4-5 times a year in the middle of nowere.
     

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