why wont my 02 serria not to go into 4 wheel drive it just keeps jumping out

the shifter is on the frool i manualy move it

Very possible internal wear, to a point where the gears won't hold. You could try a place like AAmco for a free test and estimate, or if your abilities are so that you can tear it down for repair.

ok ty and where would i try in canada i dont know how to change that in my profile

Not sure, unless you have a good transmission shop in your area. Sorry not sure about how many things are in Canada. It's been a while sense I visited there, but remember seeing several businesses as the same here in US.