Alright, as of this morning it is much better with the pressure reduced. Even at a 10 mph rolling start, it broke the tires loose, spun them in second and chirp them in third without being too rough. It will work for now, until I get that custom tune from you. Thanks!

Thanks I am looking forward to it! Just have to get through the holidays first then it's on!

That's what I figured but just like the other guy on here, I was given the option of firm, hard, or modify stock and from what I understood from that thread was that if it was supported we should also have had the option of stock tune for TCM. Maybe I understood wrong. I dropped the WOT pressures by ...

Yeah, I thought it was strange too. I had first tried the hard shift tune and switched to the firm because it was rough at WOT. I was surprised when I found the firm the same way.

I lowered the line pressure by 5% on the WOT and tried increasing it on the partial shifts tonight. I took a short ...

Any resolution to the shifting problems? Mine is doing the same thing with the firm shift tune at WOT.

I read another thread on here where the owner had the same issues as I am having. I have a 2011 Silverado 5.3 6L80 and I have the 87 tune installed and the firm shift TCM tune installed. Truck shifts fine at part throttle, but the WOT shifts are very harsh. Lew had said that maybe the CAL ID on the ...