G 10 Van V8-379 6.2L DSL (1987)
-
Drive vehicle and note the speed range that the vibration occurs at and the vibration frequency (using a Reed Tachometer).
-
Locate the tire size in the first column that corresponds to the vehicle tire size. Select the speed range that the vibration occurs in and note the
tire RPM. For example, a P215/60R14 tire turns 792 RPM at 55 mph.
-
Calculate the propshaft RPM by multiplying the tire
RPM by the rear axle ratio. For example, 792 (tire RPM) x 3.08 (axle ratio) 2439 propshaft revolutions per minute.
-
Relate the vibration frequency to the speed of the propshaft or wheels and tires. For example, a first order tire vibration in the above example
would excite the 800 CPM reed on the Reed Tachometer.
