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Well my 77 supercab has just one helper spring but it is a halt ton so it only has 5 leaves in to spring pack. My 77 highboy has just one helper spring but it has the 9 or 10 leaf,can't remember,spring pack.
I've got a couple of F350s that have the single leaf, and have never seen any with more.
BTW a common wrecker mod is to weld a piece of 2" square tube to the tabs the helper spring hits under load, so the helper is always almost touching. Cuts don down squatting when towing heavy vehicles.
Congrats on a tough truck. F350s are good machines.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.