I have reverse but no forward gears
I hope i am on the right Generation of Rams. I have a '75 dodge D100. 318, 4x4, auto. It is just a farm truck that rarely sees blacktop. A while back we drove it to the back field and shut it off to load fire wood into it. After setting for a half hour or soo, we started it back up and had no forwards gears. We tried shifting it into 4x4 hi and low with no change. Had to drive backwards all the way to the house then unloaded. The fliud seems fine. Right level, color, and good smell. Does ne one have ne suggestions. THe problem puzzles me because reverse is strong, but no 1st gear.