Sonnax bearing adapter FD-WA-25, along with heavy duty thrust bearing CH-N-1, replaces the OE impeller-side stator cap and bearing assembly in Ford A4LD, A4LD multi-plate, 4R55E, and 4R55E, 5R55E late production converters. The CH-N-1 bearing is piloted by the FD-WA-25 bearing adapter.

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