My 95 has a popping sound that comes from the rear end when I shift gears. Doesn't do it ever time and never on the down shift. When it does this it pulls hard to the right like the left rear is pulling harder than the right. I was thinking it might be a u joint but I'm not very familiar with a jeep as this is my first one. The jeep is a standard tranny five speed with a 4 cyl. Engine. Any ideas or suggestions welcome.