Suspension Control Arm and Ball Joint Assembly. For vehicles without serviceable ball joints, Proforged offers replacement control arm assemblies. Pre-installed ball joints and bushings allow for quick installation, and they've gone back to the drawing board to enhance the design over the original specifications. Direct-replacement control arms from the chassis part professionals - Proforged. About Proforged: Our products are designed using CAD programs and are validated through hardness testing, microstructure analysis, surface finish examination, and roundness testing.