Probably yank out the trans and rebuild it. Its lasted me 4yrs and I can't complain a bit with the amount of abuse I have thrown at it. Actually I'm kinda surprised It has made it this long

 

Are you spraying through the shift?

 

Yes lol

 

It sounds like lockup to me, thats alot of rpm drop... The reason I say this is because I've tuned 3-4 '07-up Silverado's and there's ABSOLUTELY nothing I can do about them turning the lockup on right after I shift into third, all of the trucks are doing the exact same thing as yours. There's some kind of lockup table missing that EfiLive didnt get. Check out this link:

https://www.performancetrucks.net/fo...2-asap-499907/

 

Watch between frames 510-550, you can see it hit third then shift/lockup again:

 

No kidding! Man no wonder I start picking up speed like crazy haha. I was always asked if the tcc was locking but I always said there's no way cause its turned off in the tune.

 

All thanks to shupe in the TCC help on T42 thread I was able to figure out my issue. Looks like the TCC was being told to lockup at 88.89 MPH in 3rd at WOT. Seems like this is a common issue on the T42s and efilive finally made a patch for it. I'm gonna set the 3rd lockup speed to a speed it will never see and test it out

 

Post up your findings, I'm interested to see if it works.

 

Post #16-up

https://www.performancetrucks.net/fo...2-asap-499907/