I just bought a 2001 Dakota Quad Cab 4x4 Sport. It has a very good body with little rust. 141,500 miles. Has 265/70 R16 tires on but came with 235/75 R15. I discovered after buying it that it has a 1" block under the rear springs and the torsion bars have been cranked to level it out. How do I figure out what size shocks I need? The front suspension needs work done as well as the rear pinion seal. The shocks are shot and need to replace them bad