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Every shock manufacturer has its own philosophy of shock valving. Specific shock valving is different within the same shock model for a 3/4-ton truck than it is for a Suzuki Samurai to cope with vehicle weight and typical use. In almost all cases, this valving is locked in by the manufacturer. The Rancho RS9000XL, ProComp's MX series, and Walker Evans 500 series shocks are unique in that each gives you an adjustable range of valving, so you can effectively soften the valving for rockcrawling and firm it up for freeway driving or towing.