A SERVICE OF

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INTERAXLE DIFFERENTIAL LOCK STARTING AND OPERATING THE VEHICLE
– 126 – Y53-6033
Regional Haul (R05/10)
than 25 mph, or while wheels are spinning or traction
is minimal; lock it before you encounter these condi-
tions.
2. Put the inter-axle differential lock switch, labeled
MAIN DIFFERENTIAL LOCK, in the LOCK position. A
light (DIFF LOCK) in the warning module on the dash
will turn on, indicating that the differential is locked
(engaged).
3. If you LOCK or UNLOCK the inter-axle differential
while moving, let up momentarily on the accelerator
pedal to relieve torque on the gearing and allow full
engagement of the clutch (the mechanism that locks
the wheels).
NOTE: If your vehicle has an automatic trans-
mission, it may be necessary to shift the trans-
mission to the Neutral position momentarily to
allow the main inter-axle differential lock splines
to fully engage or disengage.
4. Drive the vehicle through the poor traction area, keep-
ing your speed under 25 mph (40 km/h).
To UNLOCK the inter-axle differential:
1. When you reach dry pavement or better road condi-
tions where the differential lock is not needed, switch
the differential lock to UNLOCK.
2. Let up momentarily on the accelerator pedal to relieve
torque and allow the clutch to disengage.
3. When you unlock the differential, normal vehicle han-
dling will resume and the light on the warning module
will turn off.
Understeer Condition
Turning Radius When
Unlocked (Disengaged)
Turning Radius When
Locked (Engaged)
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