96 Ram 1500 Tranny shifting problem

I have a 96 1500 that the tranny has problems. The tranny will only shift if you run the shifter on the column through the gears. If you just put it in drive, it will not shift, it will just go in 1st. I had the scanner on it and it had no tranny codes, but at idle the governor pressure was 6 psi, and it showed the desired as 0. Any help would be appreciated.

the governer pressure sensor and solenoid's are famous for going bad though your symptoms are weird, usually when the governor pressure goes bad the trans still work and shifts but slips, it sometime throw trans codes, some times not..