Whenever the car has forward inertia, the back wheels will wobble back and forth despite going forward. Kind of hard to explain. In other words, the rear wheels have play. You can manually spin them and there is play. When going to drive, upon releasing the brake, the rear wheels will stop spinning, then spin forward, and will repeat this. If that makes any sense.
It doesn't. At least not in print to me. I'm kinda thick when it comes to reading text and applying it without pictures sometimes. But then, I'm kinda thick anyway. lol Any way you can post a video?