Its a 98 dodge ram 2500 with the 5.9, I bought the truck drove it for 3 weeks no problems till the last few days it started acting like it was low on fluid a few times, I checked and it was fine. Then it just quit shifting out of first the next day so I parked it. I've changed the trans filter and added 5 new qts of ATF+4. When I dropped the pan the low rear reverse band had came off and was stuck to the magnet, I put it back on and put it back together and it still wouldn't shift. Does anybody have any other ideas?

 

Did you adjust the bands according to the service manual?

Need to check fluid in neutral, park will give you an artificially high reading.

Next step would be to unplug the 8 pin connector from the drivers side of the trans. (about halfway back, goes straight down into the valve body.) Go for a drive. You will have zero automatic function though... start in first, and shift at appropriate speeds. The trans won't do anything on it's own, (including downshift......)

If the trans goes into the gear you tell it to, when you tell it to, its just an electrical problem, and probably solved by replacing governor pressure sensor and solenoid. If it still acts strange... Your fix is going to be more expensive.....