Kent-Moore J-42841-A Remover, Crank Rear Oil SealKent Moore Tools For General Motors. The crankshaft bolts have changed on 2006 up Premium V8 engines, and existing tool J 42841 will not work with the new bolts. J 42841 A will service both 2006 up and prior year seals. J 42841 A is required by Buick or Cadillac dealers who do not already have J 42841 to update.
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