Applies to: TRANSMISSION 711.620 in MODEL 901.6, 902.6, 903.6, 904.6 with CODE (M53) Constant rpm control with CODE (N05) PTO countershaft (2c) without flange with CODE (N07) PTO countershaft (2b) with flange TRANSMISSION 711.621 in MODEL 905.6 with CODE (M53) Constant rpm control with CODE (N05) PTO countershaft (2c) without flange with CODE (N07) PTO countershaft (2b) with flange