CNC-machined housing for consistency and high-quality on most applications Induction hardened to match GM OE fatigue life Greaseable where applicable: allows new lubricant to flush contaminants from the assembly, helping reduce corrosion and wear Some ACDelco Gold parts may have formerly appeared as ACDelco Professional Premium aftermarket replacement part Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models