Hello, need some help on the 6l80e. My friends truck is a 09 Denali and its totally stock besides a tune. Truck worked fine, and we got it tuned like a year ago and it feels like since then it shifts harder and harder. Right after tuning everything felt great, but now its feels like its going to lift the front at WOT during the shifts. Its just really really hard. Not sure if the tune has something to do with it. I can post it up if you need it.

 

I'd post it up, something might not be right with the trans tune.

Maybe too much line pressure or something.

 

Here you go. This was done by someone, a very reputable tuner that a lot of you should know. I dont want to mention any names, because if it is the tune, i rather talk to him personally and not involving a lot of people.

 

Sorry the attachment fails to upload. Anyone knows why? Anyway as i said, this tune is done by a profesional, so i doubt it is the tune. He said he used the tune in all of the 6l80e trans that he does and non of them has failed. And second, why didnt it do this right away? Maybe something is wearing out. I dont know.

 

Anyone? Not sure why but i cant upload the tune but heres a log file. I logged a bunch of pids i dont if they are all necesary but here you go.

 

Well the more I think about it, if it was fine for a while and overtime it started getting worse, then something sounds like it might be failing or wearing out.

 

I had the same issue with my truck, I provided a follow up log and some adjustments were made and its been great ever since.

 

Id like to look at this log later when I get to a laptop.

 

Thats what i was thinking. Even now if i write the stock tune in it, its the same. Obviously the shifts take a little longer because the timing from one to another gear were made lower but once it grabs the next gear it is as hard as with the tune in it now.

 

Could you explain a little further? What adjustments were made?