i have read a few other reports about people having problems with the allison going in to "limp mode" at red light burnouts. I too am having this problem. I would compare it to drving an older chevy v8 with a quadra jet 4barrel. you know, when you hammer down it sounds like its gonna quit, them bam ...

i have had the same issue with the "limp mode". i have seen the same impressive increase in acceleration after this. as described, when the hammer is down from a dead stop, its like its weaker than day old dish water then picks up. id compare it to driving an older chevy v8 with the quadra jet ...

Please advise, working on 04 duramax lb7, has aftermarket 4" exhaust, k&n cold air intake, and of course the diablo sport tuner. really disappointed in the gain i am seeing. the only really noticable change is the shifting. am i doing somthing wrong? even on the 120 hp tuner, no difference seen ...