PART 7: STARTING & OPERATING THE VEHICLE PUTTING THE VEHICLE IN MOTION
(R10/06) Y53-6007 – 83 –
To reduce load on the drive train, ease up on the throttle
pedal whenever you shift into LOCK or UNLOCK.
Dual Range (Two Speed) Axles
If you have this option, dual range axles provide two rear
axle ratios for operating under heavy loads or off-highway
as well as for over the road trucking. The Low range pro-
vides maximum torque for off-road work. The High range
is a faster ratio for highway speeds and conditions. A
switch on your instrument panel controls this function. You
will notice that it has a guard to protect you from activating
it accidentally.
Range Selector
Using Your Dual Range Axle
WARNING! Never shift the axle when moving
downhill. Engine driveline disengagement
may occur, eliminating engine retardation and
allowing the wheels to spin faster than the
current speed of the engine. This may require
severe braking to slow the vehicle down and
can result in an injury accident.
1. Unlock the interaxle differential before starting.
2. Put the Range Selector in the LOW range. Shift the
transmission to start the truck moving.
3. Off-Highway: When you are driving on rough terrain
and secondary roads, or under a very heavy load,
keep the axle in the LOW range. Shift your transmis
-
sion to maintain the road speed you want.
4. When you go from off-highway to highway driving,
shift the axle to the HIGH range this way:
a. Be sure the differential is UNLOCKED.
b. Keep the accelerator down and move the Range
Selector lever to HIGH.
c. Keep driving with the accelerator down until you
want the axle to shift.
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