Sounds like you have a busted linkage somewhere
Put it into reverse when moving rapidly forward.
The shifter. D is for drive which is forward and R is for reverse. N is for neutral. You have to have the breaks pressed down all the way in order to move out of park and into D or R.
time to get new trannie
PRDN stands for "Park/Reverse/Drive/Neutral," which are the different gear options found in an automatic transmission vehicle. These gears control the movement of the vehicle in different ways - park for parking, reverse for backing up, drive for moving forward, and neutral for disengaging the transmission from the engine.
Make sure transmission fluid level is correct Bad transmission pump?
could be either transmission shift linkage not engaging reverse ( stops at neutral ) worn joint connectors sometimes cause this. or reverse clutches or gears bad inside transmission.
The forward pump is shot or the throttle has a blown gasket
the forward gear clutch pack is worn out. the only solution is to get the transmission rebult.
If this is an automatic transmission, more than likely the transmission is on it's way to the junkyard. Usually failing transmissions lose reverse first, then the higher forward gears - last will be the lowest forward gears.
Linkage needs adjustment?
If you have an automatic transmission, it probably has a forward clutch/band problem.
Needs internal transmission repairs. Find a good shop.