GMC 4000 Series Service Manual page 162

DESCRIPTION
Power is transmitted from transmission to
rear axle through one or more propeller shaft and
universal joint assem blies (fig. 1). The number of
propeller shafts and universal joint assem blies
vary with vehicle wheelbases and combination of
transm ission and rear axle equipment.
PROPELLER SHAFTS (Fig. 1)
All propeller shafts are tubular type. A splined
slip joint is provided in each drive line. If a single
propeller shaft is used, slip joint is at transm is­
sion end of shaft; if two or more shafts are used,
slip joint is at forward end of rear shaft. End of
slip yoke is sealed by a cork washer, held in place
by a steel washer and a dust cap which threads
1 Tube Assem bly
2 Bearing R ollers
3 Bearing
4 Universal Joint Journal
5 Snap Ring
G M C S E R V I C E M A N U A L
SECTION 4D
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T Y P IC A L S IN G L E PROPELLER S H A F T IN S T A L L A T IO N
T Y P IC A L D O U B L E PROPELLER SH A F T IN S T A L L A T IO N
6 Yoke
7 "U" Bolt Nut
8 "UM Bolt
9 Grease Retainer Guard
10 Grease Retainer
Figure 1— Typical Propeller Shaft a n d Universal Joints
onto end of yoke. Fixed yoke may be either welded
to propeller shaft tube or it may be splined to a
stub shaft and secured with a nut and cotter pin
as shown in figure 2. It is recommended that a
scribe mark be made on slip yoke and shaft to pro­
vide for alignment of yokes later at assembly.
UNIVERSAL JOINTS (Fig. 1)
Two types of universal joint assem blies are
used on vehicles covered by this manual. Refer to
"Specifications" at end of this section for type of
joint used on any vehicle with standard equipment.
Refer to applicable Parts Book for universal joint
application with optional transmission and axles.
Universal joints are described as follows:
Joint bearing cages are retained in yoke
flanges on propeller shaft by snap rings. Bearings
11 Rubber Cushion
12 Center Bearing Support
13 Center Bearing
14 Dust Cap
15 Cushion Retainer
Sec. 4D
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