Moving back to illinois from mississippi lost tc lockup, all gauges working fine. Fluid level good and temp is in 140's. Shifts fine too, checked grounds and other wiring to pcm. Doesnt attempt to lock in 3rd or 4th!!@

 

how many miles are on your trans?
Happened to me and I needed a new tranny

 

About 1500

 

we'll then I would hope that's not the problem..... Did the place that installed it give you any warranty at all? Or did you install it yourself?

 

Check the trans fuse and try swaping the trans relay with the horn relay. I kinda doubt that will work. I'm guessing its more than likely the t/c clutch solenoid but I'm no trans pro. Hope you get it going.

 

ya i tried the fuse and relay, nothing. i was rolling 22mpg with my trailer, after i lost lock up i went down to 16......kinda sucks doing 60mph