shift pressures

[BamaBoy]

I have my 2011 silverado 1500 z71 on the 87 octane tune and it works great except shifting from 1-2, and 2-3 it shifts so hard it twists the whole truck and feels like its going to snap the rear end and tranny. I have turned the shift pressures down to -6 and still hasnt gotten any better so can someone tell me what to do before it breaks something in my drivetrain??

[06MonteSS]

try going positive on the pressure setting... going positive should actually reduce pressure the way the pressure tables are done in the gm tunes....

[BlackZ71Silverado]

try going positive on the pressure setting... going positive should actually reduce pressure the way the pressure tables are done in the gm tunes....

When I did my 2010, going NEGATIVE made the shifting more sloppy. Going POSITIVE firmed it up. Am I missing something? I thought going + added and going - took away pressure? That's how it seems to work with mine from day 1 anyway.


Still have to get my custom tune finished up on my 08. It's freezing cold and snow/ice here now that I am actually home so can't really do any logging. Probably going to have to wait until better weather gets here again?

[06MonteSS]

not sure man, I've never used the tcm parameters via the tool itself, always just went right to custom tune... I know one of the settings, either firmness or quickness, if you went negative it made it harder/quicker...

[BlackZ71Silverado]

Yeah, we don't have the "quickness" option on our tool. Must be a Software thing within you CMR custom tuning software.

When the inTune was first released, the firmness adjustment to increase was going toward the left (-) of the screen. After the big update with the torque management added, that was changed and you had to go to the right (+) to increase the firmness.