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

What's the physical difference between BA, BT, and BW ST-400 transmissions?

Discussion in 'The "Juice Box"' started by priariecanary, Nov 29, 2019.

  1. priariecanary

    priariecanary Stacey

    So I happen to have one each of the following 1967 Buick ST-400 transmissions in my shop:

    BA - Out of a 1967 GS400
    BT - Out of a 1967 Big Car, not sure if it was Electra, Wildcat, or Riviera.
    BW - Out of a 1967 Sportwagon

    I know the BT and BW transmissions have the short tail shaft and the BW has the long version. Other than that, what are the differences between, say a BT and a BA transmission? Are the valve bodies physically the same, just calibrated differently for the different car applications? Can you convert a BT transmission to a BA configuration by buying a BA rebuild kit and using it in a BT transmission or is there more to it than that?
     
    priariecanary, Nov 29, 2019
    #1
  2. BRUCE ROE

    BRUCE ROE Well-Known Member

    The general difference, is the shifts will tend to be harder and possibly at
    higher rpm, for a heavier car, or for the performance model. Most of this
    is controlled by the valve body and plate, some in the governor, vac
    modulator, and pressure regulator. Mods to these are common, I have
    never seen any factory documentation detailing these. Rebuild kits do
    not address these details, shift kits do.

    The 68 up valve bodies are often preferred, as they have another downshift
    valve. This was apparently left out of the 65-67 to encourage the use of the
    switch pitch performance mode instead. The good news is that the valve
    body/plate will interchange on most TH400 years, even with the trans in
    the car. I always run a later set with the 68 up pan (drain added) and
    common later filter set. The governor and vacuum modulator allow a lot of
    trans tuning without dis assembly. Bruce Roe
     
    BRUCE ROE, Nov 30, 2019
    #2

Share This Page