Mine vibrated around 75mph. After many trips to the dealer turns out it I got a bad couple sets of POS stock BFG's.

 

I had the Nibble between 65 and 78, above 78 and up to 85 it was gone. It was pretty severe. The dealer replaced my rear BFG's that Road Forced at 38 and 40 according to them, and installed the dampner kit. The nibble is gone although I have only driven 50 miles at 65+. I have to give credit where credit is due and at least the nibble seems to be gone.

I do still have the vibration in the pedals, console, seat and door panels. It is not major unless you are driving for 30 minutes or more and then your feet start to tingle.

I guess I have a 2004 Ford F150 Lariat 4X4 Foot Massager!

I really do love this truck though!!

My next set of tires will be more of a street tire though, and I am not overly impressed with these BFG's.