The GPM MAKX181F/RSN set provides front and rear universal dog bones and differential outdrives machined for enhanced toughness in ARRMA KRATON 8S BLX applications. Components are made from 4140 medium carbon steel with the dog bone diameter increased from 5.5mm to 7mm to reduce deflection and failure under load. A larger 5mm needle is used to lower wear rates and maintain reliable engagement between the CVD shaft head and cup during high stress use.