My 4l60e shifts great through 1-2-3 and thats it, I can shift from 4th to 3rd manualy and the convertor unlocks for about a second and then locks back up, can shift into neutral then back into overdrive at anything over 45mph and the motor bogs like its binding for a split second and goes back to 3rd. Transmission is fresh, fluid pretty, runs around 160* It has a billet 2-4 servo????

 

Anyone...........

 

TTT

 

Apreciate all your help guys, I figured it out...........

 

What was the problem?

 

Aftermarked billet servo was junk, replaced with stock one shifted great, considering the corvette servo now, not sure if the stocker will take the abuse......