This is kind of off topic but i don't really want to start a new thread.
I have a 231 tc
What is the correct procedure for shifting into 4H or 4L? shifting into 4H is no problem at slower driving speed I believe. but is it normal that I would have to put it in park or neutral to shift into 4L? The reason is that if I am going about 10-15mph and try to shift into 4L, the lever shakes/vibrates. It's scaring me. Even if i'm in park and shift to 4L it will sometimes do that. When i first got my xj it was almost impossible to shift it into 4L, one day i forced it pretty hard and it finally shifted, its a bit smoother now but it still requires much force.