just different geometry the rear coils are about the same size as the stock 2dr springs (height) i installed the grand vitara coils in the rear to help it with carrying weight and towing. the truck runs well with the grand vitara coils ride nice (bit stiff without a winch bumper) but they gave me enough clearance for 31's. rear needs a bit more height to keep from rubbing the inner wells, but they stuff up nicely and dont do any damage other then some rubbed off paint on the inner fender well.