There are several different answers, depending on what is happening. If you have a hydraulic clutch, there maybe air in the system that is not allowing the clutch to release. If it is a Mechanical clutch, a linkage may have come loose or broken. A Shifter linkage may have broken or came apart which will not allow the connection from the shift lever to the Transmission.
if its a manual trans it wont have one,as there is no reservoir
vacuume solenod rear of trans
it is stuck in 1st and the shifter is broken SOMEWHERE it might even be inside the trans. their are shifting forks inside the trans.
Stick shift or automatic? any other gears work?
you most likely need a new clutch
IF YOUR TALKING ABOUT THE TRANSMISSION , ITS SLIPPING AND IT SOUND LIKE YOU EITHER HAVE NOT BEEN PUTTING TRANSMISSION FLUID IN THE CAR ON A REGULAR BASIS OR YOU HAVE MESSED UP THE TRANSMISSION ALL TOGETHER YOU NEED TO TAKE TO A TRAMISSION SHOP AND LET THEM DO A DIAGNOSTIC CHECK ON THE CAR, MORE AND LIKELY YOU NEED A TRANSMISSION REPLACEMENT. OR A COMPONENT REPLACE ON THE TRANS.
NO, THE FLUID IS ALL THE WAY IN THE TRANS. IT WONT BOIL OVER OR ANYTHING BUT IF YOU GET CRAP INSIDE OF IT YOU CAN KISS YOU GEARS/TRNSMISSION GOOD BYE!! ''''
did the clutch cable come off? (if its a manual) that or there is a problem with the transmission.
First of all...auto or manual? Also, why was the question asked as if overdrive is it's own gear? Check your fuses first, but with lack of detail there is no definite answer at this time.
it could be the shift linkage being that both gears over there wont work
A more accurate description of the problem along with if its an automatic or manual transmission is needed.
My hyundai wont go in gear the stick feels loose and wobbley whats wron ?