trans shift point

Discussion in 'The "Juice Box"' started by Kenny462, Apr 26, 2018.

  1. Kenny462

    Kenny462 Gold Level Contributor

    What are the factory shift points TH400? I need to reset mine. BBB455 3:73 gears. TA413ect thanks kenny462
  2. Bigpig455

    Bigpig455 Fastest of the slow....

    that depends on the calibration of the transmission as it left the factory.. a TH400 has a plate with a two letter code and production year on the side.. Lets see what youre working with first. In the meantime, read up on governor modifications: I did have a thread with a recipe for a 5300 rpm shift point governor on here at one point, I'll try to find and link to it.

    Admin- you might want to move this to the "juice box" section...
  3. LARRY70GS

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

    No such thing as factory shift points really. Depends on gearing. Minimum throttle shift points range from 9-13 MPH from 1-2, and 20-25 MPH 2-3. Wide open throttle shift points depend on governor calibration (weights and springs). Minimum throttle and part throttle shift points can be adjusted in a small range with an adjustable modulator.
  4. Mark Demko

    Mark Demko Well-Known Member

    You can make it shift wherever and how ever you want.
    In fact, my '75 Electra I had (455/400) even in manual low, would auto upshift at 40 mph, at whatever rpm that was.
    The only reason I could figure at the time was "hmmm, 400 trans. usually behind a big block, 454 Chevy, 455 Buick, Olds, Pontiac, Cadillac, GM figured these engines weren't designed to spin to 6000 rpm, ahhhh lets auto upshift at 4000/4500 rpm regardless of shifter position.
    Dwayne B likes this.
  5. Kenny462

    Kenny462 Gold Level Contributor

    had my shift points chan ged today. 1-2 at 4000rpm 3-2 at4300rpm. what a difference this made in how the car runs. only downer was whenI dropped the open bag B&M parts..made me sit in waiting room.kenny 462
  6. Kenny462

    Kenny462 Gold Level Contributor

  7. Bigpig455

    Bigpig455 Fastest of the slow....

    So I'm a little confused - you had the shiftpoints changed TO 4000/4300? Do you know what weights/springs they used ?
  8. Kenny462

    Kenny462 Gold Level Contributor

    took weights springs from another t400. like driving a different car. all I know is that it is totally more faster than before. going to he track Wednesday will post times. track is 6500 ft altitude. need conversion chart. kenny462


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