Rear Spring Slap or Clunk Noise - kw leaf suspension

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Spring slap (clunk) noise from the rear of the GMT400 series truck. Noise can be heard over road irregularities, speed bumps and potholes.

Important: Do not loosen the rear axle u-bolts and re-torque during this procedure. The u-bolts should be checked for proper torque using the service manual specification. If the torque is within specification and noise is still present, install spring insulators on the leading and trailing ends of the overload spring. The vehicle should be raised on a hoist with rear wheels suspended for easier installation. The part numbers for these insulators are:

15604174 C1 K1

15604175 C2, K2 WITHOUT 8600 GVWR

15604176 C2, K2 WITH 8600 GVWR

15604176 C3, K3

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Please Note: A strip of plastic nylon is attached to one side of the insert; this side should face up toward the remaining spring leaves. It may be necessary to use a rubber mallet to install the insulators onto the ends of the spring.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(88-98 Chevrolet Silverado C1, C2, C3, K1, K2, K3 GMT400) and (00-01 Chevrolet Silverado C3, K3 GMT400) and (88-99 GMC Sierra C1, C2, C3, K1, K2, K3 GMT400) and (00-01 GMC Sierra C3, K3 GMT400)

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