TM 9-2520-246-34 (2) Although transmission models 3052 and 3053A appear outwardly identical, the internal mechanism is different. Transmission 3052 is equipped with five forward speeds and fifth speed is a direct drive. Transmission model 3053A also is a five-speed transmission, but fourth speed is a direct drive and fifth speed is overdrive. The different shift patterns for each transmission are shown in figures 1-3 and 1-4. (3) Transmission model 3052 is installed on all M44, 2½-ton, 6x6 series trucks equipped with a gasoline engine. Transmission model 3053A is installed on all M44A1 and M44A2, 2½-ton, 6x6 series trucks equipped with a multifuel engine. c. Transfers. (1) Transfer models T-136-21 and T-136-27 are two-speed synchromesh units driven from the transmission through a propeller shaft. The transfers distribute power to front and rear axles through propeller shafts. (2) Positive locking transfer, model T-136-27, shown in figures 1-5 and 1-6 is a two-speed synchromesh unit driven by the transmission propeller shaft. This transfer is equipped with an air selector valve that enables the air locking assembly to engage the front output shaft to the rear output shaft for driving the front axle. Selection of the high or low ranges of the transfer provides the truck operator with a total of ten forward speeds and two reverse speeds. (3) Transfer model T-136-21, figures 1-7 and 1-8, is designed to drive the front axle slightly slower than the rear axles and this difference in speed is taken up by an overrunning sprag unit on the front output shaft during normal operation. When the rear wheels lose traction, the sprag unit automatically engages and the front wheels also drive the vehicle. Refer to Chapter 4 for a detailed description and operation of transfers T-136-27 and T-136-21. (4) Vehicle model application. (a) Transfer model T-136-21 can be used on all M44 and M44A1, 2½-ton, 6x6 series trucks. Figure 1-5. Positive Locking Transfer Model T-136-27 (Front View). 1-3