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He thought so too, so he doesnt have it locking up.

I've got a 2010 5.3l 6spd Silverado 1500 that I had a local shop tune and now does this quirky thing when it downshifts on acceleration. More noticeable at higher speeds, but what happens is my tach...

Does anyone have a a good transmission tune for my '10 5.3l 6 spd w/ 3.42? It seems now the shifts are much firmer, which is a major plus. But now it won't do a burn out at all. Completely stock it...

With a recent tune on my 5.3l 6spd that was little more then remove the TM and fuel adjustments, kicking down at say 120km/hr instantly the tach jumps to 3500rpm but for a fraction of a second then...