On late GM 4L80-E (late single stator) converters, the inner race sometimes produces excessive wear on the stator pilot. In some cases it wears completely through the stator, damaging the bearing back-up surface on both the stator and impeller hub side. Sonnax offers a stator repair plate GM-WA-40.

Weld-in aluminum plate
Made for use with GM-N-20 enhanced thrust bearing

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