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Factory issue performance parts specific to 84-87 Buick Grand National and 89 Turbo Trans Am 2004R transmissions. This design virtually eliminates pinion gear thrust washer wear/failures due to its upgraded non rotating thrust washer design. Includes both front and rear planetary carriers ready to install in any 2004R These components are extremely rare. Limited quantity. Retro-fits THM200. 3 sets available.