Id say fisherman is correct on the crud built up on the springs and all. Joe has stock springs on his truck and it articulates real good and will actually keep all wheels on the ground when the rest of us are lifting a foot or more off the ground. he's wheeled with his truck for years though and probably has the springs loosened up. I think we need to dicect his truck and se why it does so good.
On my 715 that I plan to build for the ole lady, Im going down to the local spring shop and having them make new springs up for me.
67 M725, 67 M715, 68 M715