Specifications: 1) Suitable for model OF GM 4T65-E automatic clutch 2) Material: SAE 4620M 3) Normal modal: 1.411 4) Heat treatment: carbonitriding and hardening, case depth is 0.3~0.43mm, temper to obtain HR45N for 64min, HRC 32~44 core hardness 5) Precision shot peen gear faces and roots