74 duster

Adjust the linkage first; it might just be off a hair. See if you can push the shift level up and down a bit by holding back on it, hold it a few seconds at each small increment of movement, and see if you can get reverse with the lever anywhere above or below. If you do get reverse, then it is an adjustment. If no reverse anywhere, then make sure the kickdown linkage is in place and adjusted right, to make sure the internal pressure is not too low.