G8 V8-6.0L (2009)
Alignment: Testing and Inspection
Trim Height Inspection
Trim Height Measurement
Trim height is a predetermined measurement relating to vehicle ride height. Incorrect trim heights can cause the vehicle to bottom out over bumps
causing damage to the suspension components and symptoms similar to wheel alignment concerns. Check the trim heights when diagnosing suspension
concerns and before checking the wheel alignment.
The vehicle must be on a flat level surface and all dimensions must be measured vertical from the ground. Trim heights should be within 13 mm (0.51 in)
to be considered correct.
The suspension and trim height dimensions are for standard vehicles with base equipment only. The dimensions are for a new vehicle built to standard
specification and are intended as a guide when checking trim height dimensions at normal curb weight.
Perform the following before measuring the trim heights:
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Check the tire pressures. Refer to Tire Inflation Pressure Specifications (See: Wheels and Tires/Tires/Specifications).
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Check the fuel level. Add additional weight if necessary to simulate a full tank.
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Make sure the passenger and rear compartments are empty, except for the spare tire.
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Make sure the vehicle is on a flat and level surface, such as an alignment rack.
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Check that all the vehicle doors are securely closed.
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Check that the vehicle hood and trunk are securely closed.
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Check for installed after market accessories or modifications that could affect trim height measurement.
Measuring the trim height
Important: The vehicle must be on a flat level surface
1. Using your hands, lift the front bumper approximately 38 mm (1.49 in).
2. Gently remove your hands and allow the vehicle to lower.
3. Using your hands, bounce the front of the vehicle downward approximately 38 mm (1.49 in).
4. Gently remove your hands and allow the vehicle to rise.
5. Measure and note the C dimension for the left and right side of the vehicle, inboard of the pinch-weld flange at 544 mm (21.42 in) (1) from the
centerline of the front wheel.
6. Measure and note the A dimension for the left and right side of the vehicle from the bottom of the front wheel rim to the wheel arc along the
centerline of the front wheel.