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TCI's front pump assembly uses four Teflon sealing rings (the white and orange rings). Stock TH350s from the factory come with five cast iron sealing rings. TCI replaces the cast-iron ones with Teflon because Teflon will expand and create a better seal. In addition, TCI leaves the middle ring off which applies more pressure to the direct clutch pack and, consequently, holds better in high gear. View Related Article
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