L U B R Ic A Tio - GMC 1986 P-Truck Service Manual

The front axle propeller shaft found on four-wheel
drive vehicles requires a special lubricant at two lo­
cations: the constant velocity joint, and the slip
yoke.
Constant V elocity Joint (C/V Joint)
The constant velocity (C/V) joint, located at the
transfer case end of the front propeller shaft, must be
lubricated periodically with a special lubricant,
1050679 or equivalent. If the lubrication fitting cannot
be seen from beneath the vehicle refer to figure 9
which shows how the C/V joint may be lubricated from
above, with a special adapter J-25512-2 on the end of a
flex hose.
Slip Spline
Apply chassis lubricant at the slip spline grease
fitting until the grease begins to leave through the vent
hole.
If the slip spline is dry or corroded, it may be
necessary to disconnect the propeller shaft from the
vehicle, remove the slip yoke, and wire brush the
affected area. Wipe clean before installation.
__________________ PROPELLER SHAFT 4A-11
LUBRICATION
Figure 9—Lubricating The Constant
V elocity Joint Fitting