6 speed shift time question

[pinstripebob]

Hi all,

I've done a few 4 and 6 speed auto tunes for gas cars, but this is my first time venturing into an Allison. I've been trying to do some research, but it seems like there isn't a ton of info I've found that talks about firming up shifts or reducing shift times with these Allison transmissions. I'm a bit paranoid after reading a couple posts about reducing shift times and destroying the transmission.

The truck is a 2007 Sierra 2500 classic (older body style) with a Duramax and 6 speed Allison. The stock trans tune is attached below. With a 4L80 or 6L80, or even a 6T40, it's easy enough to shorten shift times and get a crisper shift. Is that okay to do with these? Anything I should be aware of? Any recommendations?

Any help would be awesome! Thank you!

23962

[YAKPERFORMANCE]

You have a better bet adding a shift kit to the valve body. The Allison is a trans which runs on full line on the 01-10 models they didn't go to a modulated solenoid until 2011 which works similar to a 4L80 and can increase and decrease lie pressure at different operational parameters. You can play with the shift timing some but you have to be extremely careful so you don't have multiple clutch packs applying at the same time. That isn't to say playing with the shift tables and torque model cant get you better results just make very small changes test and see if you get your desired shift feel dot go wild with your changes.