06 4.8

iTrader: (5)

Before I built my little rcsb I had a 2011 ext cab with a 6.2 and 6l80. Truck shifted great WOT even chirped the 1-2 sometimes.
A buddy of mine just stopped by after getting kooks and a Maggie put on his 2014 with a 6 spd. When it shifts it feels like the truck kills all power, shifts gears, then takes off again. I though the trans was the same in them? Is his tune that messed up and that far off or is the tuning for the new trucks that bad?

03sierraslt

iTrader: (22)

That's because it closes the TB on the shift, that's part of the engine tune. It has to be tuned out.

06 4.8

iTrader: (5)

That's insane that GM would even do that. It's probably the worst problem with the new truck.

FFDP

iTrader: (2)

Not insane, they want the product to last and want everyone, everywhere at anytime be able to drive it.

06 4.8

iTrader: (5)

Ok, I'll play Devils advocate to that. Every time a truck shifts WOT and the TB slams close then immediately open again that's wearing out the tb motor and putting more stress on an engine going from WOT-nothing-WOT again....

03sierraslt

iTrader: (22)

Ya but that TB is much cheaper then a trans. It's still a bunch of crap, because properly tuned a 6L80E transmission can handle a lot more than the stock engine

LS1FREEK

iTrader: (1)

Can you set the tune to only use timing for shift TM on '14+ trucks?