Unity 5 Wheel collider issues

I was making a racing game in unity 4.5 and has upgraded to the latest version. Since then I am facing issues with the wheel collider. I tweaked around with the values for a couple of days and have somthing that’s somewhat ok.

The issue I am facing now is that when applying motor torque there is a lot of wheel burn-out. And on collision there is a lot of forcing acting on the body(even on slight impact the body spins out of control).

Any help is welcome. Thanks again!

check this video to solve problem of wheel collider bouncing on unity5

YOUR ANSWER IS … in the update of my comment on this post, I got mine to work