Hey guys wanted to get in on this topic. I recently installed an efi live tunned by Idaho Rob. My question is I know that he is a very reputable tuner however when accelerating my truck has VERY erractic shifting. Is this to protect the stock tranny or whats the deal. For $1,100 I would have expected something alot better.
A couple quick notes before I attempt to answer you question.
First, have you contacted Rob or ATPTrucks.com? Usually they are the fastest source for good answers and information.
Second, this is an old thread and you may have been better off creating your own thread as opposed to reviving and old thread that wasn't 100% relevant.
To answer your question or attempt to.
The Allison transmission is adaptive and has adaptive learning, so it will learn your driving characteristics. If you have driven around for 60k miles like a grandpa on a stock tune and then throw on a 150hp over stock tune and romp on the throttle; you will find that the transmission won't shift right. You can do a re-learn or just drive around on the tunes for awhile as it learns.
One other note is that the Allison transmission uses a defuel in between shifts, you may also be feeling that.
All of that aside, there could be issues with your truck that are being brought to light such as fuel rail issues. When was the last time you changed your fuel filter? A data log can identify some of the issues, sometimes they aren't as noticeable with stock tuning, but larger tunes bring them to light due to the increased fuel demand.
My suggestion is to contact ATPTrucks.com directly, but you can also answer my questions above and maybe we can get you pointed in the right direction.
Poor tuning CAN cause shifting issues, but I highly doubt that's the situation here.
Have you completed a re-learn? What power level are you driving around at? When do you have erratic shifting? Does this occur when you are getting on the throttle a lot or at all speeds? Can you please elaborate on erratic shifting?