PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —72— 22-01691 (R02/02)
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, then release the accelerator until the axle has shifted.
You are now in the HIGH axle range on the highway. Shift the
transmission normally to reach your desired cruising speed.
5. If you need to downshift the axle for more power:
a. Keep the accelerator down and move the Range Selector lever
to LOW.
b. Keep driving with the accelerator down until you want to down
shift the axle.
c. Then release and depress the accelerator pedal quickly to
increase the engine RPM. The axle will shift to the LOW range.
Important Tips on Operating Your Dual Range Axle
• To avoid damaging your vehicle, shift the axle at a slower speed
until you are used to driving with the dual range axle.
• When driving on a surface with good traction, keep the interaxle
differential unlocked. You can drive with the axle in the LOW or
HIGH range.
• When driving with poor traction, lock the differential. When you
have the differential locked, drive with the axle in LOW range only.
• Always UNLOCK the interaxle differential before shifting the axle
speed range.
• Park the vehicle with the Range Selector in LOW.
Automatic Transmissions
An automatic transmission makes shifting much easier, of course.
But because your truck pulls a heavy load, if you have an automatic
transmission, it is important to use it efficiently. For correct operation,
see the manual for your automatic transmission included with your
vehicle. There is no “park” position, so you will need to apply the park-
ing brake before leaving the cab.
NOTE: If your vehicle has an automatic transmission, it may be
necessary to shift it to the Neutral position momentarily to allow
the main differential lock splines to fully engage or disengage.
CAUTION: If you shift the axle range with the interaxle dif-
ferential in LOCK, you could do serious damage to your
axles. Never shift the range with the differential locked.
WARNING! Do not leave the cab without applying the park-
ing brake. The truck could roll and cause an injury accident.
Always apply the parking brake before you leave the cab.
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