Sounds like a classic case of death wobble, but generally that occurs in straight axle front ends, like early Fords had. But I guess it can happen in any type of front end, just never thought about that.

I have heard that MMII frontend kits are not all created equal. Some omit the steady rods (or whatever the proper term is) from what the factory had originally installed. I have seen articles about how it is important to keep these in place, but really didn't pay much attention as I have never used one of these in a car.

I think we need more info so one of the guys on here who know these can help you more. Whose front end kit is it? Did you install it or have it done, or maybe you bought the car this way. Has it always done this, or did it just start. You provided a lot of info, which is good, but I think you need to give more specific info about the front suspension/steering, as that is probably what is causing it.

Don