TM 10-3930-659-34 1-10. EQUIPMENT DATA (Con’t). Table 1-1.  General Characteristics and Specifications (Con’t). Transmission Specifications: Type .................................................................................................................................. ZF of North America, Countershaft, Power Shift Forward Speeds   .................................................................................................................. Four Reverse Speeds  .................................................................................................................. Three Torque Converter Type ......................................................................................................... Single Phase, Single Stage System Pressure @ 150° 100 and 1500 rpm........................................................................ 213-242 psi (1469-1669 kPa) Axle and Differentials Specifications: Type .................................................................................................................................. John Deere, Inboard Planetary Axle with Standard Spiral Bevel Gear Differential Differential Gear Reduction Ratio  ........................................................................................ 4.333:1 Inboard Planetary Drive Reduction Ratio   ............................................................................ 4.800:1 Overall Axle Reduction Ratio  ............................................................................................... 20.798:1 Service Brake Specifications: Type .................................................................................................................................. Wet Disc Operation............................................................................................................................... Hydraulic, Foot Pedal Accumulators: Charging Medium   ................................................................................................... Dry Nitrogen Charging Pressure   ................................................................................................. 475-525 psi (3275-3620 kPa) Parking Brake Specifications: Type .................................................................................................................................. ZF of North America, Expanding Shoe Operation............................................................................................................................... Manual, Foot Pedal Mounting................................................................................................................................ Transmission Tire Specifications: Size .................................................................................................................................. 17.5-25 Type .................................................................................................................................. Tubeless Ply Rating .............................................................................................................................. 16 Recommended Inflation Pressure: Front ......................................................................................................................... 55 psi (379 kPa) Rear.......................................................................................................................... 40 psi (276 kPa) 1-6