Hey guys, long story short, I have a 2007 Silverado 4X4 that we swapped from a 4L70E to a 4L80E with a 2600 Yank converter. Got my reflashed TCM from PCM for Less, and I tuned it to my likings, so far as shifts and all that good giggity stuff goes. However! Here's the run down on a big *** issue!

1. Once we swapped the new TCM in the speedo refused to function, and then all of the sudden it started working out of nowhere, but the speedo is really jumpy from 0-5 MPH on a slow roll.

2. I get the following read outs on the dash: Service Traction Control, Service Stability Management, and an intermittent Service Brakes. Now here's what freaks me out, I hooked up my VCM Scanner and checked for codes but my scanner tells me that "No DTC's are reported."

Anybody have an idea of what the hell is going on? I'd really appreciate some advice here! I attached my tune if you guys wanna browse through it and see what could be wrong.

Thanks to all of you!
-Robbie.

 

Stupid tune wouldn't load. Tune is here at this link:

http://www.hptuners.com/forum/showthread.php?t=33967