My transmission wont shift
I just change my transmission n fluid and it still wont shift
out of 1st gear what else can it be
Level may not be up to where it should be. Some cars/trucks say to have the engine running in park and older ones may say in neutral. Either way it may not be up to the full mark. Since you did not mention what vehicle you have most responses can only give a guess in the dark. Good Luck!
It could be that your transmission fluid is just low, as Brian indicated. Check fluid level. If fluid is OK, it's probably a faulty transmission control solenoid or speed sensor, and you should have this diagnosed by a trans pro.