Gears

Examine the pinion and ring gear teeth for scoring or excessive wear. Worn gears cannot be rebuilt to correct a noisy condition. Gear scoring is the result of excessive shock loading or the use of an incorrect lubricant. Scored gears cannot be reused. Examine the teeth and thrust surfaces of the differential side gear (4236) . Wear on the hub of the differential side gear can cause a noise known as chuckle when the vehicle is driven at low speeds. Wear of splines, thrust surfaces or thrust washers can contribute to excessive driveline backlash.