Chevrolet 10 Series 1968, Service Manual

Page: 162 / 713

FOUR WHEEL DRIVE 3-23
Fig. 2 —Transfer Case and Adapter Assembly
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TRANSFER CA SE
Fig. 1—Control Lever
match the input spline of the transfer case. The adapter
assembly for the Chevrolet truck four-speed mounts on
the back face of the transmission and has a straight
through involute spline sleeve since the transmission
output spline and transfer case input spline are identical.
To summarize, the transfer case adapters differ in their
splined sleeves and mounting faces only.
FREE WHEELING HUBS
Free-wheeling hubs are available for the front wheels
of four wheel drive vehicles. The purpose of these hubs
is to reduce friction and wear by disengaging the front
MAINTENANCE ,
Kingpin Trunnion Check and Adjustment
Front axle trunnion adjustment is generally necessary
only when there is excessive play in steering, irregular
wear on tires or persistent loosening of the tie rod.
1. Raise front end of vehicle, then place jack stands
just inside of front springs.
2. Disconnect connecting rod and tie rod to allow in­
dependent movement of each steering knuckle.
3. Remove all cap screws which attach knuckle seal
retainers, then move seals and retainers free of the
knuckle.
axle shafts, differential and drive line from the front
wheels when the vehicle is operated under conditions
where front wheel drive is not needed.
The engagement and disengagement of free-wheeling
hubs is a manual operation which must be performed at
each front wheel. The transfer case control lever must
be in 2-wheel drive position when locking or unlocking
hubs. Both hubs must be in the fully locked or fully
unlocked position. They must not be in the free-wheeling
position when low all wheel drive is used as the additional
torque output in this position can subject the rear axle to
severe strain and rear axle failure may result.
POWER TAKE-OFF
Provision is made for mounting a shaft type Power
Take-Off at the rear of the transfer case input shaft.
OTHER COMPONENTS
The rear axle assembly, including service brakes, is
identical to the axle used on conventional drive models.
The parking brake operates by mechanical activation of
the service brake shoes in the rear wheels through a
pistol-grip type parking brake lever mounted under the
left side of the instrument panel.
D ADJUSTMENTS
4. At top of knuckle, apply torque wrench to one of the
steering arms attaching stud nuts, then check torque
necessary to turn the steering knuckle.
Starting torque should be:
5 to 10 in. lbs..................................Axle 44-5F
15 to 35 in. lbs................................ Axle 44-5HDF
NOTE:
Knuckle should turn smoothly through
turning arc but have no vertical end play.
IM PORTANT: Temperature will affect turning
torque considerably.
5. If torque is too low on axle 44-5F, perform the
following:
CHEVROLET TRUCK SERVICE MANUAL