4l60e lost 1st and 4th after converter install
#2
Moderator
About the only thing 1st and 4th have in common is Solenoid A. If you are getting a code, scan it to see if it is solenoid related. Perhaps a pin got bent or a wire broken on the trans connector. Just a guess at this point.
Or maybe you are in limp mode - just 3rd gear.
Or maybe you are in limp mode - just 3rd gear.