Won't shift into overdrive on 1991 Dodge D150

My automatic transmission won't shift into overdrive but all of my other gears shift correct ly could it be something simple like my overdrive button?

by in Arcadia, FL on April 28, 2011
1 answer 1 comment
ANSWER by , April 28, 2011
Not likely. Check the transmission fluid for condition and level. A qualified transmission technician will likely need to weigh in on the situation.
COMMENT by , May 07, 2011
Check the Vehicle Speed Sensor for correct operation, located on the driver's side of the tail shaft of the transmission.