The OE plastic 3-tab washers break or melt under normal operation in listed GM TH180, TH180C (3L30) and 4L30-E transmissions. Sonnax 3-tab bimetal thrust washer and shim kit 54701-03K replaces the OE plastic washers in both pump and center support locations.

The steel tabs on the Sonnax thrust washer eliminate breakage
The bronze thrust surface will not melt like the OE plastic thrust washers
Shims provide more flexibility when setting endplay and allow for rebuilding units after thepump has been resurfaced. The Sonnax washer kit can be stacked to cover a build height from .075" through .125" in .010" increments
This kit contains enough parts for pump and stator support locations

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