Originally Posted by F N CUDA

Just hit the throttle with your car or truck sittin on the stand.
You'll see what out of balance looks like, especially with the larger offroad tires.
4wd is crazy out of control.
I got a prop balancer from Hobby People for about twenty bucks that suspends an axel between two magnets. Seems to work really well with modeling clay.
Find the heavy side, add clay to the light side, done when the wheel stops in random positions.
Now throttle up your car on the stand.
Sweet huh?