Only after the tranny warms up. Its doesn’t seem like its slipping, just not engaging. Other than not going into reverse the tranny runs fine, with no sign of slipping in any gears. No codes either. I was thinking it may be a solenoid?

 

NO, No reverse would not be a solenoid issue it would have to be a leak in the hydraulics.

 

Umm, that doesnt sound good.. What would cause something like that? Im guessing im gonna have to pull the tranny to fix it?

 

Bump for any more info..

 

broken seal. ring. piston. mising or loose plate at rear of valve body

 

heat related problem sounds ike either where the pump stator rides inside the reverse drum is tore up or something with the lo-reverse clutches.