Does programming the tcm help me any if I am runing a co-pilot??

Does programming the tcm help me any if I am runing a co-pilot??
What specifically are you looking to do?

Some drag racing and some pulling.

You could tweak shift point MPH/RPM, you should be shifting ideally for drag racing, for sled pulling I shift it manually. It's really up to you, one thing DO NOT CHANGE SHIFT TIMING, you don't want a tie-up!!!!

James, you can adjust where the truck shifts by looking at your logs. For example, lets say your 4-5 shift is at 3250rpm, well that drops you down too low in the rpm range in 5th gear, so..extend the WOT 4-5 shift to 3450rpm or 3500, or 3600. This will help the truck to stay in a better HP range after the shift. This is just an example. Best way is to go out and log changes to see what wotks. Then track testing to see if anything improves ET.

Alright, thanks Rob. I'll do some experimenting after the Holidays. Merry Christmas to everyone here!!

ive played with shift timing a lot and never had a tie up, u just cant be stupid with it and go in little steps. Cause if you look at the timing values in T/H mode, they are much lower(faster) than in normal mode.

ive played with shift timing a lot and never had a tie up, u just cant be stupid with it and go in little steps. Cause if you look at the timing values in T/H mode, they are much lower(faster) than in normal mode.


I am not a expert of any type .... nor have I played with any of the tables your looking at ...


I think some of what your seeing is due to converter clutch lock up and the time needed to make sure the clutch pack can grab the power and not over run the upshift.

I am not a expert of any type .... nor have I played with any of the tables your looking at ...


I think some of what your seeing is due to converter clutch lock up and the time needed to make sure the clutch pack can grab the power and not over run the upshift.


the allison does not work that way. It has nothing in common with any other automatic trans.