Plug that Bore: U150/250 shift complaints
Valve-body bore wear has become so common that one can just about predict which bores will wear when a new transmission hits the streets. Any valve that is regulating is up for grabs. TCC, pressure control, clutch regulating valve, whatever you want to call it, if it moves back and forth quickly and consistently, more than likely it’s going to wear the bore.
The SLT and SL1, 2 and 3 solenoids used in the U150/250 transmission (Figure 1) can easily be positioned incorrectly, causing a variety of malfunctions such as wrong-gear starts, no shifts and bind-ups, to name a few.