I'm taking the rear springs off my 2WD 1986 parts truck and putting them under my 1986 4WD truck, you gain about an inch of lift due to the spring under axle layout of the 2wd, by running the 2WD springs on the 4WD with a spring OVER axle setup because of the extra arch in the springs, not to mention they flex awesome, anyone else doin this swap? You lose some load carrying capacity though, I may remove the overload leaf.