took it in and the guy at the cheby dealer said, it most likely needed to be balanced. He said go up the street to tire mart, they can do a better job and cheaper. So off the wife goes, they hooked it up on a balance dealio and then they noticed that one of the key spacers was in the wrong postion and the front end was uneven. This was causing the shaking. So they fixed that balanced the tires and WOW, its like a new truck.....
Thanks guys.....
I told you the BFGs were not the problem !!!! :yuk: