I don't know if you have checked the bushings and shackles, I changed mine, and lubricated between the leaves, made a noticeable difference. Apparently radial tires make a difference, I haven't tried them. But mostly it's a truck, which is why it rides like a truck, an antique truck at that. That is why you don't buy a jeep to go road racing or a Porsche 911 to go four wheeling.
