NEED HELP MECHANICAL ISSUE (possibly transmission)

I used to have a 79 Winny on a dodge chassis like you have. If you look closely where the rod along the steering column connects to the pivot point at the lower end there is an offset pin which goes into a bushing. This bushing wears until the hole is too big to allow proper movement to the arm on the transmission. The solution is to replace the bushing. I had to make one out of a piece of steel tubing. You'll probably need help. I would try a Dodge dealer or a good independent shop. Good luck. -Mark.