SoCalDesertRider wrote:

I have forgotten what Supersprings are. I think they are some kinda add-on spring device that grabs one end of the leaf pack and pulls it up??

Anyways, I would go with either re-arcing the stock leaf packs and adding a leaf or two to them, or replace them with heavy duty leaf packs.

I did the same thing Marty did with his truck. I went from the stock 5 leaf packs to heavy duty 7 leaf packs with much longer, thicker leafs and about 3000 lbs more spring capacity for the rear axle. Huge difference in how the truck handles the weight of the 3500 lb utility body I carry in the bed of the truck.

I wish I had pics of the stock F350 SRW springs to compare them to the new springs. The new springs so much heavier and bigger than the old ones it's not even funny. The leafs are longer and much thicker. The old ones looked like they belong on a 1/2-ton. The new ones have almost as much carrying capacity as stock F450 springs.










Here you see the factory stock helper spring above the main leaf packs. The frame stops rest on each end of the helper spring. That spring use to be almost laying on the main packs with the original spring packs. Now it just barely being compressed. The truck is about 6 inches higher in the back when fully loaded now with the new springs than with the old ones.



This is how the truck sits with 3500 lbs in the bed, just above level in the rear. No air bags or other suspension aids, just heavy duty leaf packs.