I am running 1.03 TB's and new 5 leaf rear springs. The new bars did slightly stiffen up the ride, but not appreciably. The rear springs on the other hand really stiffened things up as the old ones were very tired. Again, I am not opposed to getting better shocks but just wanting to know if that would help eliminate the bottoming when I am going fast and the road dips. That is the only time I see this happen.