Lock up problems

[87gn-newbee]

Went for a drive today and trans doesn't LU in 3rd unless I manually do it but it does it fine in 4th when supposed to. Now when it used to LU you could really feel in not no more. What could be the problem?
Dan

 

[87gn-newbee]

Where are the trans gurus at Bruce,Mark Lonnie, Chris?
Bruce called and left an e-mail.

ttt

Dan

 

[Otto J]

its one of the pressure switches on the valve body, the one thats points toward the back. Unless it is built in to your chip,or other wiring problem
Otto