1. If you have recently registered with a gmail email address, you must contact me, as gmail will not forward our confirmation email to you. Contact me and jim@trishieldperformance.com to complete your registration.
    Dismiss Notice
  2. In and effort to reduce the spam on the site, several years ago I had went to a program where I manually approve each and every new registration. This approval gives you full access to the site, to pictures, and to post, among other things. To be able to enjoy the full potential of the board for you, you need to be fully registered.. and that's easy.. Just send an email to me at jim@trishieldperformance.com and I will verify your registration. This policy will remain in effect indefinitely, as it has completely eliminated the bad actors from our site, who would spam and hack it, once they gained access. Thanks JW
    Dismiss Notice
  3. The "Group Buy" for the 1967-68 Deluxe Steering wheel recasting is now officially "Open". Now is the time to start sending in the wheels. The latest date that the wheels must be received by Kochs is 31 March 2025 The cost for each wheel is $750. The only "up front cost" is your shipping the wheel. If you send in more than one wheel, each additional wheel will cost $700. Shipping and insurance to Kochs and return shipping will be extra. You will be contacted by Teresa to make payment for the wheel(s) and return shipping and insurance when your wheel(s) is complete. The shipping will be factored on your delivery address and insurance. I will be sending the contact information all of you have sent me to Teresa at Kochs. Send in your wheels, horn pad and hardware and paint color sample if applicable. Please include: First and Last Name Shipping Address Phone number email address V8Buick "Member Name" Wheel Color (SEE THE BOTTOM FOR WHEEL COLOR) Pease read the "shipping to Kochs" below. There are two addresses. One for USPS Mailing One for FedEx and UPS shipping You can use USPS/Mail, UPS or FedEx to send in your core. Use the appropriate address depending on what service you use to ship. If you use USPS/Mail ship to: Koch's P.O. Box 959 Acton, CA 93510 Attn: Teresa If you use UPS or FedEx ship to: Koch's 7650 Soledad Canyon Road Acton CA 93510 Attn: Teresa Kochs Contact: Teresa (661) 268-1341 customerservice@kochs.com Wheel Color If you wheel is Black, you can list that in your information you send in with your wheel. For colored wheels, please contact Teresa about specifics for wheel color if you do not send in a color sample to match. Please contact me if you have any questions. Thank you to everyone for your participation in making this a reality. And "Thank You" Jim Weise, for allowing and facilitating this project! Michael .................... to remove this notice, click the X in the upper RH corner of this message box
    Dismiss Notice
New users Registered with a gmail address Attention All new Users 67-68 Deluxe Steering wheel recast Group buy

To freshen up or not to freshen up my TH400, that is the question...

Discussion in 'The "Juice Box"' started by 68Buick-Jim, Apr 5, 2025.

  1. 68Buick-Jim

    68Buick-Jim Gold Level Contributor

    I have a Th400 in my 68' Skylark that I installed about 23 years ago with only about 1500-2000 miles on it. The car has been sitting a long time. I did not build the transmission, but it's supposed to be a street/strip-heavy duty build with improved internals. I've not had it out of the car since installed and now that I'm getting ready to finally do my 455 swap into the car while I have the Buick 350 out, I wondered if I should go ahead and disassemble it, do an inspection and at minimum replace all the internal seals and gaskets. I was going to just replace the front and rear seals and let it go at that but since I'm going to have it out anyway I thought about going through the whole thing. I've never been inside a TH400 but feel I can handle it since I've rebuilt about a dozen TH350's for myself and others, not to mention a couple of Ford AOD's and one Ford A4LD overdrive transmission.
    When I drove my Skylark last time in 2005 it did have an issue of starting in 2nd gear from a stop. If I manually put it in 1st then Drive it would upshift fine. But always when coming to a stop it would start off in 2nd gear. It did not do this when I first put the transmission in so an inspection probably would be a good idea. I suspect it has a governor issue but not sure. I just would like some input and advice as what I should do.

    Thanks,
    Jim
     
    68Buick-Jim, Apr 5, 2025
    #1
  2. 12lives

    12lives Control the controllable, let the rest go

    If you've done a TH350, the TH400 should be a piece of cake. Since you mention an issue the odds even more tilted toward going through it. My 2 cents is - do it!
     
    Last edited: Apr 7, 2025
    12lives, Apr 5, 2025
    #2
    Dadrider likes this.
  3. 68Buick-Jim

    68Buick-Jim Gold Level Contributor

    Ok. Appreciate the input! I do think I'll go ahead and disassemble the transmission and check it out. I'll get a new converter too to match my new engine.

    Thanks,
    Jim
     
    68Buick-Jim, Apr 6, 2025
    #3
  4. 12lives

    12lives Control the controllable, let the rest go

    Talk to JW about the converter.
     
    12lives, Apr 7, 2025
    #4
  5. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    I wouldn't bother, but I'm trying harder not to make a project of everything lately..
     
    436'd Skylark, Apr 7, 2025
    #5
  6. BRUCE ROE

    BRUCE ROE Well-Known Member

    Throw in a $50 seal kit now, avoid those failures for a couple more decades.
    400 Might be the easiest 3 speed auto to rebuild, a few special tools really help.
    Bruce Roe
     
    BRUCE ROE, Jul 4, 2025
    #6
  7. 12lives

    12lives Control the controllable, let the rest go

    update?
     
    12lives, Jul 5, 2025
    #7
  8. 68Buick-Jim

    68Buick-Jim Gold Level Contributor

    I haven't started on the transmission yet. It's been so hot here in the Louisville area I think I'm going to put it off until September. I'm definitely going to go thru it though when I do get it pulled out of the car.

    Jim
     
    68Buick-Jim, Jul 6, 2025 at 5:52 PM
    #8
    12lives likes this.

Share This Page