my good sir, you are magical... I don't know what you did to that tune but it feels like I'm driving a different truck!!! Quicker snappy shifts that feel nice and firm, it downshifts to go up hills/pass on the highway like a champ! I can't thank you enough! I did allot of research before purchasing ...

This is my 2010 GMC Sierra 4x4 (5.3L, 6spd) has a magnaflow muffler and resonator delete. 4" ReadyLift lift kit, 33x12.5" Cooper Discoverer ST tires. Nothing special but its taken me got Canada twice now, installed a Diablo tune and adjusted the TCM for firm shifts and i love it!!! (second...

So I've changed from Hard shift to Firm, different problem (tunes uploaded with this post are Firm) when the truck down shifts (as if im going to pass on the highway) it stutters into the lower gear. Also i noticed its rather sluggish to downshift, feels like its "stupid" and doesn't know ...

Hey all, purchased my intune and tuned my truck, problem is the "hard" shift tune is very intermittent in how it shifts the truck and feels like stock most of the time... I've even tried turning up the pressures at part throttle to 20% it doesn't seem to make much of a difference. any idea...