Build a TH200-4R For 1,000 HP
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Getting back inside the transmission, when a 200-4R is used with a nonlockup converter, the check valve and seal located in the end of the input shaft must be removed (left). These parts apply the lockup clutch feature in a stock transmission but are unnecessary. A fringe benefit is there's now more fluid available to lubricate the planetary gearset. A stock lockup-style input shaft is shown on the right for contrast. View Related Article
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