stewart, did you find out anything today?

 

Hmmm, my trans does almost exactly what you're describing except mine down shifts really hard sometimes. Once from 50 mph it acted like it was going to downshift into 2nd then hit the rev limiter and shifted into third. I've played with the tuning some and added some TM back in (mainly just a little reduction in the shifts) and its been a lot better; just really sloppy. I've never considered sensors being the problem.

 

put another throttle position sensor in there and everything is back to normal. i guess it wasnt downshifting good enough and shifting early because it thought it was only getting 80% throttle or so. the funny thing is i beat up on another silverado yesterday morning with my truck acting up. it was a slammed rcsb 5.3 with a hood and 327 proudly displayed on the side of the cowel hahahahaha.

 

hm, might have to try that sensor out. what was the price on it? also, could this have anything to do with why my speedo is still 5mph off even after 2 tunes? (gear ratio /tire size correctly input as well)

 

just changed out the tps, guess i'll see how it worked...

 

i have an extra throttle body layin out in the garage that i stole the tps sensor from so it was a freeie this time

 

Hey glad you got it worked out was in my list of possibilites, Holler anytime you need anything you know I am literally always there.

 

will do. im about to punish your transmission even more with about 180 more ponies to the ground and more traction

 

yea this lil **** was 45 bucks, seems better, but the speedo is still off 5mph