Bully Dog Triple GT

[HAILSTATE]

Anyone ever used one? I have a friend with one for sale and I would like some opinions. I have a 2014 GMC Sierra Z71 with the 5.3. Just installed a 3 inch front 1 inch rear leveling lift kit and 33x12.50R18 Open Country RTs. I need to reprogram the speedometer and would like a tune to help with the loss in MPG on the highway.

[LongrangeLauber]

I'm pretty sure their trans tune was the issue with my 02 Silverado going through 3 trannys, 1 of them was overbuilt for the truck. Too much line pressure I believe. I have a diablosport i2 tuner and well worth the 320 i paid for it.

[powerhaulic]

had a GT on my last two trucks, worked great.