Competition Engineering designed this C2645 3-Way Adjustable Shock to allow the racer to dial-in the extension as well as compression to meet changing track conditions. This front shock is adjustable in three ratios: 90/10, 80/20, as well as 60/40. The shock absorber design allows the front end of the race car to rise rapidly upon initial launch. This creates greater weight transfer as well as better traction to the rear tires. As the car travels down the track, the front end will gradually descend to its ride height without unloading the rear tires, which is a major cause of wheel spin. These ratios reflect the percentage of force required to extend (first number) as well as compress (second number) the shock absorber. You can quickly change the valve setting by simply compressing the shock fully and rotating the shaft until the indexing notch mates with the desired setting on the body. It’s as simple as twist and click! Competition Engineering C2645 Front Adjustable Shock Features: Fits Ford Ranger from 1983-1989 Internal Design: Monotube Gas/Hydraulic: Hydraulic Extended Length: 17.22 in. Compressed Length: 12.22 in. Adjustable: 3-Way Adjustment Method: Twist Upper Mount: Stud Lower Mount: Bushed Eyelet Bushing Material: Rubber Bushing Color: Black Boot Included: No Body Diameter: 2.000 in. Hardware Included: Yes Shock Body Material: Steel Shock Body Finish: Gray Paint Threaded Body: No Rebuildable: No Quantity: Sold individually Competition Engineering specializes in chassis components, supplying everything from steering and suspension in addition to ladders and rear frame kits. They have the parts to help simplify as well as speed up building your race car.