Service Parts Information:: Overview

Part Number Description

8658678 Retainer, 3-2 Line Control

Parts are currently available from GMSPO.


Part Number Description

8668123 1-2 Servo Cushion Spring (559)

Parts are currently available from GMSPO.

Service Notes:


If the above condition persists make sure the 3-2 coastdown valve (located in the oil pump body) is not stuck and moves freely in its bore.