One of the main problems we found with stock suspension arms on these trucks is they have excess clearance built into them, making critical settings such as camber, caster & toe angles nearly impossible to lock down. RPM Savage, Savage-X, Savage-XL & Savage Flux A-arms have been engineered to strict tolerances and in some areas, we've eliminated as much as 0.051" (or in excess of 3/64") of slop in the suspension system and completely eliminated the need for shim kits! These tighter-tolerance A-arms allow critical suspension settings to remain long after they've been set. Furthermore, our A-arms are still silky smooth throughout the entire range of suspension travel.