TheÂ CST 8" Lift Rear Leaf Springs add height to the rear of your 2001-2010 GM 2500HD/3500HD. Used with blocks and u-bolt kits for CST 11" kit, or other custom applications. Leaf Springs do not retain OE load rating, not for towing.Â Features:Â 8" LiftÂ Rear Leaf Springs (Pair) Notes: Comfort-ride springs, not for towing. Leaf Springs do not retain OE load rating.Â Additional rear height may be desired for 11" HD Lift.Â Rear carrier shim may be required on trucks with two-piece rear drive shaft.Â Â Truck Freight Item: Allow 1-2 Weeks for delivery. Truck freight charges apply.