Cummins shifting problem
My 95 Dodge truck (automatic) is having issues shifting into fourth gear. I've tried replacing the tps and the torque converter lockout solenoid, but no improvement. More often than not it doesn't go into gear, but when it finally does, it shifts out within ten seconds. Seems to be more likely to shift into fourth when I'm going up a hill. RPMs don't seem to make a difference - it'll drop down into third and send the RPMs up almost to 3000. The other gears seem to work fine. The truck has 180K miles on it, and had the tranny rebuilt at 100K. I'm out of ideas - any suggestions would be great.