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

Shift rpm issue

Discussion in 'The "Juice Box"' started by BQUICK, Sep 4, 2024.

  1. BQUICK

    BQUICK Gold Level Contributor

    Fixed my trans that let go at BG. All it was: pin/nail on shift shaft broke and it went into neutral on the 2-3 shift. Luckily it didn't tickle reverse or I might not be typing this now.

    Anyway put a backup trans in with my same governor that shifted at 5000 in drive (I liked that so I can slow car by shifting where I want for 10.00 index). NOW it shifts at 6400 both shifts in drive. Was shifting at 6800 but I backed modulator all the way out and got it to 6400.

    Why would new trans shift so much higher with SAME governor that shifted at 5000?

    (picture of pin that broke)
     

    Attached Files:

  2. Mark Demko

    Mark Demko Well-Known Member

    I thought the modulator was for part/ light throttle up shift and the governor handles WOT shift points.
     
  3. Jim Weise

    Jim Weise EFI/DIS 482

    Was the detent system working on both transmissions? Minor variations would be valve body, couple hundred rpm.. A lack of a functional detent system on your first trans, vs a working detent system on the second could explain that much rpm difference in the shifts.

    JW
     
  4. BQUICK

    BQUICK Gold Level Contributor

    Detent working on both.
    Yeah, vacuum modulator mainly for part throttle but I have found adjustable red stripe one do affect WOT but only a max of 300-400 rpm. Not sure why but maybe affects line pressure?
    I'm wondering if new trans was set up with more line pressure than previous one.

    I'd like to try another governor but can't remove it in car (trans is tight fit in tunnel.)
     
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Modulator senses engine vacuum, which should be at or near zero at WOT. Not sure how the modulator could affect the WOT shift point 300-400 RPM??? The governor sets WOT shift points.
     
  6. Bens99gtp

    Bens99gtp Well-Known Member

    Not upshift in auto range can occur till governor pressure overcomes throttle pressure. An increase in line pressure would increase both of these. So your governor pressure is down.....maybe internally leakage.......or your throttle pressure is higher......different valve sizes, or different springs in valve body can effect shifts by a few hundred rpms too.........could be a combination of a few different things here
     

Share This Page