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Peterbilt 387 - Page 82

Peterbilt 387
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PUTTING THE VEHICLE IN MOTION PART 7: STARTING & OPERATING THE VEHICLE
– 84 – Y53-6007 (R10/06)
d. Then release the accelerator until the axle has
shifted.
e. 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 & move the Range
Selector lever to LOW.
b. Keep driving with the accelerator down until you
want to downshift the axle.
c. Then release and depress the accelerator pedal
quickly to increase the engine RPM.
d. The axle will shift to the LOW range.
Important Tips on Operating Your Dual Range Axle
NOTE: If your vehicle has an automatic transmis-
sion, it may be necessary to shift it to the Neutral
position momentarily to allow the main differential
lock splines to fully engage or disengage.
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 LOW or HIGH range.
SHIFT AT ANY SPEED EXCEPT
IF A WHEEL IS SPINNING
03029
.
Interaxle In Unlock
When you are driving with poor traction, lock the dif-
ferential. When you have the differential locked, drive
with the axle in LOW range only.

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