Who makes 6\" lift front springs which will not sag ? Am looking to lift my 82' shortbed by 6" to clear the intended 35" BFG M/T tyres. Am looking for advice on which make front springs to use, I would hate to fit a set and then have the Diesel engine make them sag quickly. For the rear I am using a pair of 56" springs from a 3/4 ton Suburban along with the 14 bolt FF axle to increase the load capacity, ORD shackle flips moved back along the frame and 2" blocks. I may use some custom spring perches as well to move the rear axle back a bit. Advice on the springs would be much appreciated.