Sierra Classic 2500 4WD V8-8.1L (2007)
1. For vehicles equipped with a torsion bar suspension turn the bolt (1) that contacts the torsion arm clockwise to raise the and counterclockwise to
lower the height adjustment. One revolution of the bolt (1) into the nut increases the Z height by approximately 6.0 mm (0.2 inch).
2. For vehicles without torsion bars, replace damaged or worn components as necessary.
D Height Measurement
Important:
There are no specified trim heights specifications on leaf spring vehicles because it is not an adjustable feature. The height of the suspension will
depend on the option content of the vehicle as well as the aftermarket equipment that is placed on the vehicle. The measurements are used for
comparison only and should be within 15 mm with the vehicle at curb and no accessories.
1. With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 inch).
2. Allow the vehicle to settle into position.
3. Important:
Measure the metal to metal contact points of the rear axle to the frame on the inboard side of the leaf springs.
Measure the D height by measuring the distance between the bumper bracket and the top of the rear axle tube.
4. Repeat the jouncing operation 2 more times for a total of 3 times.
5. Use the highest and lowest measurements to calculate the average height.
6. The true D height dimension number is the average of the highest and the lowest measurements.
7. If these measurements are out of specifications, inspect for the following conditions:
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Sagging front suspension-Refer to Front Coil Springs Replacement or Torsion Bar Replacement (2500 Series).
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Sagging rear leaf springs-Refer to Leaf Spring Replacement.
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Improper tire inflation-Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label.
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Improper weight distribution
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Collision damage