Overdrive not engaging. on 1990 Dodge Ram 50

1990 Dodge Ram50 4WD with 2.4L 4 speed automatic transmission and the overdrive won't stay engaged. Swapped out the tranny solenoid and fresh fluid and filter, i thought the solenoid screens were clogged. It will shift into OD and stay for just a minute and then right back to drive and stay there. Any suggestions would be great. Thank You in advance, Jim

by in Knoxville, TN on February 28, 2011
1 answer
ANSWER by on March 04, 2011
The PCM controls the overdrive solenoid. It is possible you may have a poor connection either at the PCM or the overdrive solenoid connectors. make sure all are clean and secure. Also, FYI, if your brake switch is defective, it will kick off the overdrive as well.