... .Surface treatment Carburizing, hardening and tempering, nitriding, heavy duty truck synchronizer hub Detailed Product Description ISO/TS 16949:2009 ZF Technology ... :Sinotruk,Howo,Steyr,North Benz,Hongyan,etc. OEM parts Item Synchronizer body (for 3rd and 4th speed)Item No.1310 304 158Brand ... (AK), JAC, Zonda, Daewoo, Neoplan, Kaisiboaer, etc. heavy duty truck synchronizer hub