General Motors GM-42991 Strut Rod SocketGeneral Motors GM 42991 Strut Rod Socket Kent Moore Tool Number: J 42991 To properly remove and install the front strut rod nut, GM 42991 is required. This specialized tool is designed to work in conjunction with GM 39642, which holds the strut shaft securely in place. GM 42991 enables precise engagement with the strut rod nut while allowing a socket to stabilize the strut shaft. Failure to use GM 42991 may result in: Increased labor time Improper