Maintenance Instructions
Automatic Transmissions
Check operation of the transmission neutral safety switch. Try to
start the vehicle in all shift selector positions. The starter should
ONLY operate when the shift selector is in Neutral or Park (if
equipped).
Drive Shafts
At the regular lubrication interval, check universal joints, slip
joints, slip joint boot, and carrier bearings for any evidence of
wear or looseness. Should drive shaft vibrations occur, stop the
vehicle immediately to avoid possible hazardous consequences
or damage to other components.
Suspension (Air and Steel Springs)
CAUTION
Do not adjust air suspension height to any setting
other than the specified setting. Altering the
height setting will change the driveline angle and
may result in unwarrantable component damage,
such as transmission component damage.
Verify drive axle air suspension height at the PM interval.
See the appropriate Service Manual for suspension height
specifications.
NOTE: Suspension alignment must be maintained at all times.
Periodically:
• Check condition of spring leaves for evidence of fatigue,
bending, or breakage.
• Check condition of suspension mounting brackets and
bushings.
• Check that suspension mounts (brackets, bushings,
fasteners, etc.) are tight.
• Check that torque rod mounting fasteners are tight.
• Check U-bolts as follows:
1. After the chassis has been operating under load for
1,000 miles (1,600 km) or six months, whichever
comes first, the U-bolt nuts must be retorqued.
2. Thereafter, the U-bolt nuts must be retorqued every
36,000 miles (58,000 km).
NOTE: See U-Bolt Nut Torque Chart in the Maintenance
Intervals and Specifications section.
Steering
General Information
WARNING
Always follow recommended procedures for
steering system maintenance. Failure to maintain
the steering system in proper condition can
cause reduced steering ability resulting in
property damage, personal injury, or death.
192 3879634R1
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