PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —71— 22-01691 (R02/02)
To reduce load on the drive train, ease up on the throttle pedal when-
ever 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 provides maximum torque for off-road
work. The High range is a faster ratio for highway speeds and condi-
tions. A switch on your instrument panel controls this function.
Here’s how to use your dual range axle:
1. Unlock the interaxle differential before starting.
2. Put the Range Selector in the LOW range. Shift the transmission
to start the vehicle moving.
3. Off-Highway: When you are driving on rough terrain and second-
ary roads, or under a very heavy load, keep the axle in the LOW
range. Shift the transmission to maintain the desired road speed.
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.
WARNING! Do not use the differential lock during downhill
operation or at speeds above 25 mph (40 km/h). When it is
engaged under these conditions, your vehicle will exhibit
“understeer” handling characteristics. This “understeer”
condition will cause your vehicle to not turn as quickly and
more steering effort will be required, which can cause an
injury accident.
WARNING! Never shift the axle when moving down hill.
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.
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