I put a stockish transmission awhile back. At the same time I copied and pasted stock TM settings from an SS truck and put it in my tune. Idea being to not beat on the thing. Anyway at full throttle the 1-2 shift has been terrible. A big bah dah at shift. I have been laying it off to the TM.

Anyway I got tired of it and went in and removed the TM. Still doing it. Logged it . Mind you I am DBW. My foot stays planted to the floor and the TPS is going to 39% at the shift. WTF? I've played with it a bit but I am stumped.

 

why aren't you reading any boost?

 

Because of the throttle pull. I'm in boost right before and after this instance.

 

weird...you never experienced this until the trans swap....hmm

 

what tranny is it? im assuming 4l80e.what tranny was it before? have you looked at the abuse mode to see if its disabled?

 

It would do this occasionally with the FLT but on the 2-3 shift.

 

4l65e. Abuse mode is now off. Had been on and thats what I thought was causing the awful shift.

 

Sometimes mine will read like 97% for a blip and I never really thought much of it.

 

 

One of the drawbacks of DBW. You aren't really in control of the throttle.