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This one of a kind part introduces a press fit between the direct drum and the sun gear shaft. By doing this the direct drum and sprag assembly is forced to run on the transmission center line. This keeps the sprag from angular overrunning in hi gear which can destroy the sprag. Other benefits are less harmonics in 1st and 3rd gears and reduced wear between the drum and center support. Fits all 1997 and up 4L80E center lube transmissions.