I don't think it is a MUST, but if it is for UP TO a 4" lift your axle will sit off to the side a bit.

Is the one you bought adjustable?


Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges

What this country needs is unemployed politicians.