I have a 02 gmc cc 4x4 dmax w/ banks 6 gun w/spped loader:ro) set at level 3 mostly. Tranny is stock. Trans shifts fine when driving normal( maybe alittle pause when shifting from 2nd to 3rd). Problem occurs when giving it some pedal. 1st pulls good but not like I think it should, When shifting to 2nd and 3rd the motor just revs to 3k rpm and starts defueling( feels like its in neutral). It will do this till I let up off pedal, then it will shift. It will also do same thing when driving and I give it enough pedal to make it down shift( it will again feel like neutral) till I let up. So do you think the tranny's gone, banks needs some adjustment, or some thing else. :help:

Only 2-3 Up & down??

How's your ATF level?

My truck only does it during acceleration and the fluid level is good and pretty clean.

I forgot to mention, alittle larger than stock tires, 285's(heavy duty all terrain) not 245or 235 like stock. if this makes a difference