Im not sure if this is something that can be corrected or not, but if the truck spins the tires at all in first gear it will fly right past the 1-2 shift point and bang the revlimiter hesitate, and then make the shift into second gear. But if the truck has traction this doesnt happen, it always makes a clean 1-2 shift. This is crazy annoying and if there is anything that I can do in the tune, or change in the tranny to solve this I will.

My shiftpoint is around 6200rpms and even if I set the revlimiter at 7000rpms it still does it. And in hp tuners it seems like the only way to change the shift points is to change the WOT shift mph speed, changing the wot rpm shift settings doesnt seem to have any affect on shift rpm?

 

If you email me your tune I will tell you whats wrong with it... PM me.

 

im having the same problem on a 4l80e, part throttle it all shifts fine, wot it will not shift into second hit the rev limiter then i let out and it will shift

 

same here with shift rpm, ihave it set at 6150rpm and it shifts at no more than 5800rpm thats in D in M it reaches the cutoff 6200 no problem
i think ill be changing the WOT shift speed

 

im having a similar problem did you ever find out what made it not shift beyond that rpm?

 

Did get fixed and what was the solution.

 

Needs an ECM and TCM adjustment.