1998 Plymouth Voyager, Automatic, 228k miles.  No codes.  I have a 1998 Plymouth Voyager with the 3.3 liter engine.  I back out to go to work.  I drive to work.  I park at work.  I go into work.  I work.  I leave work.  I get in car.  I start car. I put car in reverse.  Car does not move.  No indication that this would happen.  Engine runs fine.  Tranny works fine.  No noises that would indicate possible future failure.  If I put the car in reverse, it will back up if on flat on sloping downhill terrain.  It will not back up if I have to back up uphill or over a bump.  If I step on the gas when backing up, the engine revs, but the car does not move any faster in reverse.  When I say the car will backup when going downhill, I do not mean the car moves because I am going downhill.  If on a flat surface, I can put the car in reverse, and it will move, albeit slowly, and as previously mentioned, if I step on the gas, the engine revs, but the car does not move any faster.  My question--Is there any possibility that this can be fixed by removing only the tranny fluid pan?  Could it possibly be a reverse solenoid (if there is one)?  A loose bolt that can be fixed by removing the pan?  Anything else? Or will the tranny have to be dropped and completely rebuilt.  I am still driving the vehicle.  I just have to be careful how I park.  The engine always runs well.  The tranny runs perfectly in all the forward gears.