Have you ever changed the fluid and filter in the transmission? If not, that's the first thing you should try.
Put it into reverse when moving rapidly forward.
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.
Sounds like you have a busted linkage somewhere
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.
If you have an automatic transmission, it probably has a forward clutch/band problem.
Needs internal transmission repairs. Find a good shop.
reverse drum inside of trans is stripped out the fix is teardown unit and replace with abeast drum from transtar
If the automatic transmission on a 2002 Kia Rio won't go into park and there is no reverse, there is a problem inside the transmission with the gear bands. Each gear has a separate band and sometimes they wear out. New bands need to be put in or a new transmission needs to be installed.
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.