probably just a motor or tranny mount is bad, we replace those from time to time, if it was a bad cv axle all you have to do is look under the car and look by the wheel and you'd see the cv axle boot busted and grease all over the place, not to mention you'd hear a clicking noise whenever you take a sharp turn. i really doubt the problem is a cv axle. the fluid needs to be cherry red and you need to check it with the car running in Park after you go through all the gears slowly, if your mounts are fine, and your tranny fluid is red, then more than likely you're gonna need a tranny & torque converter.