One kit does both axles. Everything you need to convert your truck to the AG-400 design and upgrade from 40,000 lbs to 46,000 lbs comes in this kit.

 

 

2 Torsion Bars

4 Bolts, 4 Nuts, 4 Washers

4 Center Torsion Bar Bushings

4 Collar Assembly

8 Torque Rod Bushings

8 Air Bags

4 Shock Absorbers

 

To figure out the axle spacing, measure from center to center of hubs on rear tandems

 

C651001