Transmission issue

[Aries2009]

2009 Ram 1500 Crew Cab 4x4, 178,000 miles. - Earlier in the week I went to move the truck. Backed up and when I shifted to Drive the truck won't move. Looked at the dash and it indicated the truck was in 4th gear. No Reverse or Drive. When pushing the truck pack up the driveway I mistakenly had it in Park so the truck won't move. Shifted to Neutral and the truck was pushed up the driveway where it now rests. In recent weeks it would stall when cold and coming to a stop. The other day I started the trucked the truck and it shifted into Reverse but it didn't engage when shifting to Drive. The truck creeped a little on hi revs and that's when the engine light came on . I've replaced trans filters about four times over it's lifetime. Never did replace the cylindrical seal that comes in the box due to extra work and lack of appropriate tool. The engine codes scanned as; P0731 - Rotational differences between input and output sensors and P0876 - transmission fluid pressure out of range. Does anyone have any suggestions on where to start and how to proceed? Thank you for your consideration.

 

[Wallyb4]

What is the fluid level on the dip stick? Make sure to check when the truck is level and in either neutral or park. That will depend on manufacture and I don't remember. Also what color is the fluid? When you shift from Rev to Drive do you feel anything like a slight bump in the veh or in the pedal?

 

[Aries2009]

Fluid level was within the cold range. Color appears normal. Filters and 5 quart top off about 30,000 miles ago. It bumps into Reverse 1 time after sitting for a day and then nothing when going into Drive.

 

[Aries2009]

There is little grade on driveway 1 - 3% maybe. Can't move it to level street w/o a push or pull.