GMCtrk

iTrader: (27)

I think Charlie has mine locking somewhere between 40-45mph. When I'm getting on the highway this thing is a DOG.....it locks up and runs about 1100rpm. What is the disadvantage to raising my lockup to 60mph? Why does GM lockup the tq. converter around 40mph? I remember with the 4.8 it was such a dog when it locked up the truck would not accelerate even if you pushed the pedal what seemed like an inch. It was horrible. I like what Trever1t did with his, it doesn't lock up until he eases up on the throttle, otherwise I think he locks it at 45.

phasemaster1

iTrader: (11)

Mine locks normal 43mph locking it at 60mph will hurt your mpg.

KevinF56

iTrader: (9)

i think stock lock-up is 38mph, which mine is. i dont have a problem with it. if you don't want it to lock, just keep your foot in it a little more until you're ready for it to lock.

BlackGMC

iTrader: (31)

Mine locks up at 34 if i am barely on the throttle... I have the TPS Apply table set to realease if i get back on the throttle fairly quickly... The reason I set my so low it 99% of the driving i do in the truck is city between 35-40...

GMCtrk

iTrader: (27)

I think it would have been worthwhile for me to have gotten HP Tuners before I started modded and learned to tune myself. It must be nice to be able to make adjustments on the fly.

quicksilverado

iTrader: (8)

I forgot how low it was from the factory. I lock mine at 52 mph and sometimes think that is to low.

trever1t

iTrader: (14)

It's never too late to buy the software and begin learning. I am only "experimenting" with my trans settings, it seems no matter where I set the tcc to lock it makes NO DIFFERENCE because I am not permitted to roll at any speed for my than 1 minute! Too much stop and go.
Wheatly can raise your tcc set points, for highway driving mine are set to lock at 50mph in 4th.

GMCtrk

iTrader: (27)

you have so much torque I don't think it matters where you lock up at !

trever1t

iTrader: (14)

sure it does...when locked at low speeds it just chugs, same as yours. Any throttle will allow mine to unlock. Damn I love this cooler weather, it's 55 this morning, I just left a big ol patch leaving the light

chevythunder06

I have my converter lockup at 55 in 4th. It is a little high, but I love the way it feels with my truck and what I have done.