GMC T Series 1994 Repair Manual page 906

assembly. Torque is transm itted through the drive
sprocket by the connecting drive chain. Since the front
output shaft is splined to the driven sprocket, torque
flows through the front output shaft to the front propeller
shaft and axle resulting in high range four-wheel drive.
In the 4LO range, the path of torque through the
transfer case is exactly the same as in 4HI range but,
EXTERNAL COMPONENTS
jH Clean
• The transfer case using solvent and a stiff brush.
k -+ | Remove or Disconnect (Figures 1, 2, and 3)
1. Front output flange nut (76), flat washer (56), rub­
ber sealing washer (57), and the front output flange
(58) from the front output shaft.
Figure 1— BW4470 Front Case Half
Figure 2— BW4470 Rear Case Half
with one major difference. In the 4LO range the range
hub is shifted into engagement with the planetary carri­
er. This causes the input gear to rotate the planetary
pinions inside the annulus gear, causing the planetary
carrier, range shift hub, and mainshaft to rotate at a
gear reduction of 2.69:1.
DISASSEMBLY
2. Rear output yoke nut (75), flat washer (56), rubber
sealing washer (57), and the rear output yoke (79)
from the main shaft.
3. Speed sensor (59) from the rear bearing retainer
(50).
4. Four-wheel drive indicator switch (60) from the
front case half (31).
5. Rear bearing retainer bolts (61) and rear bearing
retainer (50) from the rear case half (46).