had transmission running good in the morning and all the sudden it would not go to 3rd gear took it to a friend that has done many other of these and is good with them told him to go ahead and rebuilt it which he did but did tell me that the transmission look putty good inside, he put it back in and still does the same took it down again not finding anything he put all new electrical components checked electrical and even used 2 other computers from other trucks just in case same deal any feed back what to look for thanks Alex

 

Stuck valve in valve body wiggle each one with screwdriver till you find her