hello my name is noel am located inland empire ca. i recently bought a 1986 samarai suzuki jx tintop. when driving it home there was a nasty vibrating shaking at 40mph-45mph. once i got home i noticed the front wheels are bigger than the back. so i did some history digging and the previous owner had replace the front axle. my question is where do i start to figure out what is causing the problem. i have asked around and researched and found several issues could be the problem. does anyone have any advice to get me started on this issue.