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ok for the guys that are running a 4 link kit or anybody that knows about them, what spring rate did you go with for drag racing and did you use the same spring for street use? i want to have 2 sets of coilover springs one for the drag and one for street. i know i want to go soft for drag racing but i dont know how soft to go...also i dont know how stiff to go for street use...i know the GVWR is 5,000lbs and the rear is 2,447lbs but i dont know what the payload is on this trucks...but im still a little confused as to how the spring rate works...i have an 09 ext cab and im going to narrow the backhalf and i already have the 4 link with the coilover shocks but still dont know which springs would work...so if anybody has any help i would really appreciate it, thanks in advance