Cheap TH400

Discussion in 'The "Juice Box"' started by '72 Skylark Custom 4bbl, May 14, 2019 at 6:54 PM.

  1. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Evening everyone,

    Have an opportunity to get a TH400 out of a 70's Firebird with a 455 for $65.

    Seller claims it has a short shaft. I get that it may not run but I figure at this price I could send it up to JW to make it bullet proof to go behind my built 455.

    What's your guys take?

    Thanks,

    Kyle
     
  2. gsgnnut

    gsgnnut Well-Known Member

    Cant go wrong if you ask me. I have a long tail th 400 core for free if anyone here wants it. Pick up only Westfield mass.
     
    Nailhead Ronnie likes this.
  3. Bigpig455

    Bigpig455 Fastest of the slow....

    Yeah I'll get it.. I'm in Hartford and I have the week off. I'm free tomorrow AM?
     
    Nailhead Ronnie likes this.
  4. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    What generally works better or at least fits without too many modifications?

    Short or long shaft?

    Kyle
     
  5. Bens99gtp

    Bens99gtp Well-Known Member

    shorts fit better, long were used in big cars. but either can be swapped around. for 65 that's a good deal
     
  6. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

  7. BRUCE ROE

    BRUCE ROE Well-Known Member

    If removing a lessor trans, you will need to put the shortest TH400 yoke
    on your driveshaft. Done many here, never shortened a driveshaft. I do
    not know why you need a carb bracket, but the same shifter shaft linkage
    has worked between TH350 and TH400 for me, NOT for others. Set up
    the speedo gears in the process, better yet make any correction for error
    in your old setup. Bruce Roe
     
  8. Jim Weise

    Jim Weise 1000+HP

    If its a short shaft 400, that is less than half the core charge..

    Should look like this:

    DSC01416.JPG

    DSC01419.JPG
     
  9. Bens99gtp

    Bens99gtp Well-Known Member

    super pretty, what's the secret to get it that clean
     
  10. Jim Weise

    Jim Weise 1000+HP

    Chem clean, power wash, glass bead blast.

    JW
     
    Nailhead Ronnie likes this.
  11. Bens99gtp

    Bens99gtp Well-Known Member

    man your goi g to make me want to get a blaster setup just so mine can look that clean and then no one see it one in. what a shame to have something that pretty hidden.

    think nhra will let me put a mirror under my car permanently to show that thing off if I can get it that clean
     
    Nailhead Ronnie likes this.
  12. Nailhead Ronnie

    Nailhead Ronnie Life's 2 Short. Live like it.

    Or a see thru floor.
     
  13. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Here’s a pic of the tag. Are there any other I.D. numbers I can look for?

    4” tail shaft.

    Sure as **** it was only $65;);)!!
     

    Attached Files:

    Last edited: May 16, 2019 at 5:18 PM
  14. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    PX, 1975 Pontiac Lemans and Gran Prix behind the 400 V-8
     
  15. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Thanks Larry. Guy also said it was switched to a manual valve body.

    Should go behind my 455 with no problems I hope.

    Kyle
     
  16. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"


    Yup, Buick-Olds-Pontiac, it'll bolt right up.
     
  17. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Good deal. Thanks again Larry.

    Is the 4” tail shaft the best fit?

    Kyle
     
  18. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Yes, short shaft.
     
  19. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Thanks.

    As always a wealth of knowledge Larry

    Kyle
     
  20. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Is a manual valve body any better or worse than an automatic valve body?

    Know a lot about cars just have always steered clear of transmissions.

    Kyle
     

Share This Page