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Thread: Any Good Info on 45RFE/545RFE Tranny Tuning

  1. #1
    Tuner in Training
    Join Date
    Feb 2019
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    38

    Question Any Good Info on 45RFE/545RFE Tranny Tuning

    I'm looking for anyone that can point me in the right direction or maybe explain to me some on some of these tranny settings.

    Like with is 2-2 prime and 2 Prime-2 and 3-2 Prime and 2 Prime-3

    Why are some things in negatives?

    Limit A and Limit B on Acceleration Limits?

    I have googled and googled and not been able to find what the Prime Shift Points are and/or how they work. Lastly and advice you may have on this specific transmission would be nice.

  2. #2
    Advanced Tuner Blue Bee's Avatar
    Join Date
    Mar 2017
    Location
    DFW
    Posts
    330
    These transmissions are pretty weird. The limits you are looking at are more of torque management type stuff, it's negative because reducing torque/slowing the moving components in the trans (accel limits of moving parts). Keep in mind during during WOT upshifts it doesn't use "all" the gears. Some of the prime stuff is used during a passing situation to prime for the gear change it will end up at. Stick with the simple stuff, some small pressure changes, shift points then when you have lots of time and log everything on the trans side you possibly can, mess with limits and torque stuff...at your discretion!

  3. #3
    Tuner in Training
    Join Date
    Feb 2019
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    38
    Will do