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Chevrolet Silverado / GMC Sierra. Service manual - part 2831
Fig. 91: Power Flow
Courtesy of GENERAL MOTORS CORP.
When the BW 4485 is operating in the AWD mode, the power flows from the transmission to the
transfer case input shaft (1). The input shaft (1) delivers the power to the planetary differential
(4). The case of the planetary differential (4) is splined to the input shaft (1). The planetary
differential (4) splits the torque 40 percent through the front differential pinion gears (3) to the
front sun gear (8). The front sun gear (8) is engaged with the drive sprocket (2), which drives the
chain (9) to the front output shaft (10), and power is delivered to the front propeller shaft. 60
percent of the torque to the rear output shaft (6) goes through the rear differential pinion gears (7)
and rear sun gear (5), which is connected to the rear output shaft (6) and to the rear propeller
shaft.
SPECIAL TOOLS AND EQUIPMENT
SPECIAL TOOLS
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado