Its weight is supported on a frame crossmember as shown in figure 13-12. The illustration also shows how the shifting lever would extend into the driver s compartment near the lever operating the main transmission. Their purpose is to provide the necessary offsets for additional propeller shaft connections to drive the wheels. Transfer cases in heavier vehicles have two speed positions and a declutching device for disconnecting the front driving wheels. Two speed transfer cases, such as the one shown in figure 13-13, serve also as auxiliary transmissions.
Some transfer cases are complicated.
When they have speed-changing gears, declutching devices, and attachments for three or more propeller shafts, they are even larger than the main transmission. A cross section Figure 13-12. Auxiliary transmission power takeoff driving winch. Transfer case installed in a four-wheel drive truck. Compare it with the actual installation in figure 13-13.