2016 Chev Z71 5.3 l 8 speed trans

[gski]

ok cool thanks will post results ..sorry just a bit frustrated from the initial try..

[gski]

I loaded the update-plugged in the I2--went to truck it read the pcm/tcm..now sates send files to diablosport? I have to send these again and then tune? does not appear to take the tune just yet?

[gski]

update wil NOT take tried it mult times even on a laptop will not do the update not sure why but I would like it to be able to run updates periodically... only shows intuneupdater2.exe file???

[chrysio]

Just an update after I sent in my TCM file the next morning I received the file from tech support , dropped it in my In tune folder and it updated the programmer, then it work perfectly installing the tunes on my truck, also tried going back to restore stock tune and then back to 87 tune without any issues.
The only other question I had is if it was possible to adjust the throttle booster, in the advanced tune under modified parameters. Tire size was easy and firmer shift worked well.

[gski]

Quick update - the tune is in and I did some adjustments and it it very good so far / thanks for the assistance I am pleased with the results! I would not hesitate to recommend one to anyone looking to improve the performance on a gm truck

[White Denali]

So this new tune for the 8 speeds works good? I have mine ready to go but waiting to hear if the 8 speed tune on tcm is a lot better than the stock. Mine shifts all the time and takes a lot of peddle to shift down.

[chrysio]

I have had mine on for a week or two and am very happy with the changes

[White Denali]

What changes u do? When it ask u if you want to tune tcm it ask firm or hard shift so I picked firm. Can you just have it tune your tcm without picking firm or hard? I got it loaded with 87 tune but haven't drove it yet.

[White Denali]

I think I know why nobody talks about the tranny tune for the 8 speeds I loaded mine firm shift not hard but it shifts
Softer than when it was stock and the shifts seem jerky not crisp almost like a hesitation and it still shifts all the time doesn't hold gears any longer. Very disappointing to wait this long and to really not have any better than stock and maybe not even as good as stock. Anyone else have a commment?

[mikel]

thats certainly not the expected outcome and not what others have reported, can you try the hard shift as well and let us know what you experience?

[Zach]

I think I know why nobody talks about the tranny tune for the 8 speeds I loaded mine firm shift not hard but it shifts
Softer than when it was stock and the shifts seem jerky not crisp almost like a hesitation and it still shifts all the time doesn't hold gears any longer. Very disappointing to wait this long and to really not have any better than stock and maybe not even as good as stock. Anyone else have a commment?

Mind posting the trans tunes up from your tool?

[White Denali]

I noticed now I have a little over a 100 miles it maybe be a little better maybe. But to post tranny tune is it the same as last tune written like for ecm?

[Zach]

Yes. It will be named tcm. Please post both the last tune written as well as the backup

[White Denali]

Ok but monte SS just confirmed what I was thinking.

shift points are not changed in the preset tcm tunes.. they only adjust shift pressure and how quick it shifts.. if you want it to hold gears longer, you need to modify the tcm tune yourself and adjust shift points..

[White Denali]

here they are