if their is no slipping or any other transmission issues and it is just only the loss of overdrive try replacing the brake light switch
yes it does
NO!...overdrive is for highway driving, with an empty truck, not towing anything, 55mph plus. Straight from the mouth of General Motors my friend!
How do you change the door hinge pins and bushings on a 2002 GMC 1500 pickup truck?"
A 1994 is not carburetted. It is fuel injected.
Should be the 4l80e
not soon it is its top selling truck.
The sensor is located by the catalytic cnverter on the inlet side.
Under the truck on the drivers side frame rail.
Between the throttle body and the intake manifold.
Hard to answer your question when you don't even list which truck and what engine. Look at the link below and pick the correct truck and engine. http://autorepair.about.com/library/firing_orders/bl-gmc-firing-94.htm
You will find it in the gas tank, and you will have to remove the tank to service it.
I require an electrical diagram for a 1994 gmc 1 ton dually with a 7.4L gas engine. Thanks