K 2500 Truck 4WD V8-6.5L DSL Turbo VIN S (1998)
4. Measure the D dimension (2). Measure from the bottom surface of jounce bracket (6) to the top of the axle jounce pad (3).
5. Push the rear bumper of the vehicle downward 38 mm (1.5 in).
6. Gently remove your hands. Let the vehicle rise.
7. Repeat this operation for a total of three times.
8. Measure the D dimension.
The true D dimension is the average of the high and the low measurements.
