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Engine Mounts
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Test engine mounts by having an assistant rev the engine slightly with the brake held firmly, alternating between 1st & Reverse, while you watch the mounts with a flashlight &/or mirror. More than 1/4" movement between the block & frame indicates separation or failure. Alternatively, a prybar may be used to lift the block away from the frame.

4.9L, 5.0L, & 5.8L mount-to-block fasteners have 5/8" hex; '85-96 mount-to-frame perch stud is threaded 12mmx1.75 with 18mm nut

Normalize engine mounts by loosening them and, with engine running and brake pedal applied, shifting transmission from NEUTRAL to DRIVE and back to NEUTRAL. Tighten mounting bolts and road test.

WARNING: The electrical power to the air suspension system (if equipped) must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch. Failure to do so can result in unexpected inflation or deflation of the air springs, which can result in shifting of the vehicle during these operations.

Neutralizing:
1. With the vehicle in NEUTRAL, position it on a hoist.
2. Loosen, but do not remove, the powertrain/drivetrain mount fasteners.
3. Lower the vehicle.
4. Move the vehicle in FORWARD and REVERSE 0.6-1.2 meters (2-4 ft). CAUTION: Do not twist or strain the powertrain/drivetrain mounts.
5. With the vehicle in NEUTRAL, position it on a hoist.
6. Tighten the powertrain/drivetrain mount fasteners.
7. Lower the vehicle.
8. Test the system for normal operation.

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See also:
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Molding your own poly engine mounts