Eaton Fuller Fuller Synchronized Boosted 6 Speed Model: FS-5406A Serial: G0112666 Part Number: TA-C15-034260 Cust Part Number: YC35 7003 HB FS-5406A & FS-6406A: Left and right sides operate off 5th speed countershaft gear. 38-tooth gear, 6.35 pitch, 22° Helix Angle, 20° Pressure Angle