Truck is in SIG below. Heres what happens. I have no problems taking off, in fact I'm impressed with the off the line this 6.2 produces. Anyway, what happens is I'll be taking off and engine sounds like its passing shift point but never shifts until you really go at it and then it just JERKS into 2nd. Its a pretty bad jerk too. What could cause this. I hope I dont need a new tranny. from 2nd to 3rd it'll sort of do the same thing but not as bad.