When it comes to upgrading the rear suspension on a classic truck, there are number of options to be had, ranging from the mild (new springs and shocks) to the wild (independent rear suspension).

A stock Model A Ford, even refreshed with decent tires, is comfortable driving at around 40 mph—maybe up to 50 in short bursts. In my town, where rural 45-mph roads are a license to go 70, driving a ...