Hi everyone, first post and i am begging for help 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*????

 

Do a search for "Shift Solenoid" and see what you find. I posted the symptoms of my car which had a bad solenoid a while back, so you might even look for my post regarding that.

 

Was your not shifting into OD?

 

Use the search feature noob.

Full description:
https://ls1tech.com/forums/automatic-transmission/161121-intermittent-trans-problem-autotap-scan-included.html

 

Ok your problem was a little different, mine has no problem from a dead stop only OD, the lockup and all works great...

 

Thanks for the help guys, I figured it out............