I just changed the transmission in my 2001 Hyndai Elantra and it is not shifting thourgh gears and taking off slow

when you put it in reverse,first thing you feel a spring.after tthat you lift,
a security plate,this plate prevent you from going reverse into 1 gear.
cause the axel turn a little further when you allreddy has stop the car.
this takes two sec.thats why when putting it in reverse after you feel the spring you wait two seconds,then puch al the way in reverse.

sounds like normal behavior

Hi there, I live in Colombia South America and I have a HYUNDAI Elantra 2001 automatic transmission and it behaves exactly like yours. I have the best mechanic guy intown and also the dealer garage take down the whole transmission and nothing changed. It seems now to be something with the electric wiring system.

I would recommend you to have the electric system checked.

Good luck.

Check the transmission fluid level. If necessary add fluid. However you probably have a more serious problem. Take the car to a qualified transmission mechanic.

Did you check the transmission fluid level? If necessary, add fluid. However you probably have a more serious problem. Take the car to a qualified transmission mechanic.

NEED check engine light code. just shooting in the dark, but it could be your throttle position sensor or the gear indicator (some times called neutral safety switch). to try and reset it (works on some models) when its doing this (giving you grief). pull over to the side of the road when safe and shut off the car (put in park) then press the accelerator all the way to the floor for 30 seconds. then start the car (take foot off of accelerator first) might cure the problem. engine error code would be most helpfull

Sounds like a fuel pressure problem. Check/inspect your electrical connections to the fuel pump (power & ground). Also, connect a fuel pressure gauge to the fuel line at the fuel injector rail - leave it connected so if and when you have this problem again, you will be able to determine if the cause is fuel pressure/pump.

Rechk the fluid level. If it is ok, take it back. If the valve body was remove and not properly reinstalled, problems like this occur. I too would assume the filter was changed but with the machines available today, The trans can be flushed of old fluid without missing a coffee break. Good Luck, Ned

try changing your transmission filter if the problem continues try taking your car to a transmission shop and see what they tell you

your shifts correctly, as your driving it downshifts and stay stuck at that gear when u stop and try to take off but intell u turn off your car and restart it it shifts correctly intell a few mins later. i am thinking that is a speed sensor (out signal problem) mounted on top of your transmission next to the battery tray, you will see couple of cable linkages next to it ...