Chevrolet 30 Series 1967 Service Manual page 211

tial Lock" system is the same as previously described in
this section under "Vacuum-Operated Differential Lock."
AIR SHIFT CYLINDER
A piston type shift cylinder is mounted on forward rear
axle torque divider case cover. Piston rod is connected
to sliding clutch. As air pressure is applied to piston,
sliding clutch is shifted into locked position. When air
pressure is exhausted from shift cylinder, spring pres­
sure returns sliding clutch to unlocked position.
PROPELLER SHAFTS, UNIVERSAL JOINTS
Tubular type propeller shafts and needle bearing type
universal joints are used on all model trucks. An inter­
nally splined sleeve which compensates for variation in
distance between rear axle and transmission is located at
the forward end of single or rear propeller shafts
(fig. 98).
The number of propeller shafts used is dependent upon
An extended-life universal joint, which does not require
periodic inspection and lubrication, has been incorporated
in several applications on the
This extended-life universal joint is identified by the
absence of the lubrication fitting, which is present on all
trunnions not equipped with the extended-life feature.
A lubrication fitting is also provided on each sliding
REMOVAL
CAUTION: When trunnion bearing "U" clamps
are removed to remove the propeller shaft, tape
the bearings to keep them clean and from be­
coming damaged. Propeller shaft guards may
be removed, if necessary, by removing nut at
each end of the guard.
Single or Rear
Remove rear trunnion "U" clamps, lower the rear of
AND BEARING SUPPORTS
General D e s c r ip t io n ............... .. .......................................4-53
Maintenance and A djustm en t............................................. 4-53
Component Part R e p la c e m e n t.......................................... 4-53
R e m o v a l.......................................... ..............................4-53
D is a s s e m b ly ............................................................ 4-55
A s s e m b ly ...................................................................4-55
Installation ...................................................................4-55
GENERAL DESCRIPTION
MAINTENANCE AND ADJUSTMENTS
and series vehicles.
1 0 2 0
COMPONENT PART REPLACEMENT
Shift cylinder should be removed, disassembled, and
the piston seals replaced whenever leakage is indicated
at the cylinder.
DIFFERENTIAL LOOKOUT
Removal and Installation
Removal and installation instructions may be found in
the "Truck Overhaul Manual" under "Vacuum Operated
Lockout" or "Air Operated Lockout."
INDEX
the wheel base of the vehicle. On vehicles which use two
or more propeller shafts, each shaft (except the rear) is
supported near its splined end in a rubber cushioned ball
bearing which is mounted in a bracket attached to a frame
cross member. The ball bearing is a permanently sealed
and lubricated type.
sleeve to lubricate the splines. A plug is staked into the
yoke end of sleeve to retain lubricant and a small hole is
drilled in the end of this plug to relieve trapped air.
opposite end of the sleeve is sealed by means of a cork
packing in a retainer which screws on the end of the
sleeve.
propeller shaft and pull back to disengage the sleeve at
front of shaft. Remove shaft from under vehicle.
Front
Remove four front flange nuts at transmission and, if
equipped with intermediate propeller shaft, remove the
rear trunnion "U" clamps. Remove nuts and lockwash­
ers attaching bearing support to frame cross member and
pull shaft assembly from vehicle.
REAR SUSPENSION AND DRIVE LINE 4-53
Page
CHEVROLET TRUCK SERVICE MANUAL
The