Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual page 355

4A-8 PROPELLER SHAFT
Fig. 4A-1 6 -S e a tin g Snap Rings
CENTER SUPPORT BEARING-FIG. 4A-17
CAUTION: See CAUTION on page 1 of
this section regarding Center Support
Bearing fasteners.
1. Remove strap retaining rubber cushion from bearing
support.
2. Pull support bracket from rubber cushion and pull
cushion from bearing.
3. Pull bearing assembly from shaft.
4. Assemble bearing support as follows:
a. Install inner deflector on propeller shaft, if removed,
and prick punch deflector at two opposite points to make
sure it is tight on shaft (Dana Style).
b. Fill space between inner dust shield and bearing with
lithium soap grease (Dana Style).
c. Start bearing and slinger assembly straight on shaft
journal. Support propeller shaft and, using suitable length
of pipe over splined end of shaft, press bearing and inner
slinger against shoulder on shaft.
d. Install dust shield over shaft, small diameter (Dana
Style). Install bearing retainer (GM Style).
e. Install rubber cushion onto bearing.
f. Install bracket onto cushion.
g. Install retaining strap.
Installation of Propshafts
When reinstalling propshafts, it is necessary
NOTICE:
to place the shafts into particular positions to assure
proper operation. This is called phasing.
All models with 32 splines
key, as shown in figure 4A-18, to obtain proper
phasing. The shafts can mate only in the correct
position.
G and K models with 16 splines
phased as shown in figure 4A-19.
LIG H T T R U C K SER V ICE MANUAL
shaft into transmission and attach rear U-joint to axle.
propshaft yoke must be bottomed out in the transmission
fully forward before installation to the hanger .
proper phasing is accomplished with the alignment key,
shown in figure 4A-18.
half into transmission and bolt support to crossmember.
a. Slide grease cap and gasket onto rear splines.
b. Rotate shaft so front U-joint trunnion is in correct
position. See figure 4A-19.
c. Take rear propeller shaft and before installing, align
U-joint trunnions as shown in figure 4A-19. Attach rear
U-joint to axle. Tighten grease cap.
d. Torque bearing support to crossmember and U-joint
to axle attachments.
CONSTANT VELOCITY UNIVERSAL JOINT
(Snap Ring Type) RETENTION
Disassembly
2. Remove rear trunnion snap rings from center yoke.
Remove grease fitting.
3. Place propeller shaft in vice as shown in figure 4A-
20. Drive one rear trunnion bearing cap from center yoke
as shown in figure 4A-20 until it protrudes approximately
3/8".
interference of rear yoke half with center yoke.
4. Once the bearing cup protrudes 3/8", release vice.
Grasp protruding portion of cup in vice and strike center
yoke as shown in Figure 4A-21 until cup is removed.
Remove cup seal by prying off with a thin screwdriver.
6
remove rear yoke half bearing cups. Remove rear trunnion.
7. Gently pull rear yoke half from prop shaft. Remove
all loose needle bearings. Remove spring seal.
in same manner as described in Steps 2, 3 and 4. Before front
trunnion can be removed all four (4) bearing caps must be
removed.
Assembly
fittings, trunnions and yokes. Assemble all needle bearings
in caps (27 per cap); assemble needle bearings in front yoke
(28 total). Retain bearings with a heavy grease. Assemble
seals to bearing cups. If seals are damaged U-joint should
be replaced.
2. Place front trunnion in drive shaft. Place center yoke
on front trunnion. Install one bearing cup assembly in front
yoke. Drive in to a depth that the snap ring can be installed.
use an alignment
Install snap ring. Install remaining cup in front yoke. Install
snap ring.
3. Install front trunnion bearing cups in center yoke in
same manner.
must be
4. With front trunnion completely installed, install seal
on prop shaft (large face first). Gently slip rear yoke half
on prop shaft using care not to upset rollers. Insert rear
1. For models with one piece propeller shafts, slide
On vehicles with two piece propshafts, the front
2. For C-P models with two-piece propeller shafts,
3. For G-K models with two piece shafts, install front
1. Remove auxiliary front propeller shaft from vehicle.
Keep rear portion of propeller shaft up to avoid
5. Repeat steps 3 and 4 for remaining bearing cup.
. Once the center yoke cups have been removed,
8 . Remove front trunnion from center and front yoke
1. Clean and inspect all needle bearings, cups, seals,