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Also inside the pump housing is the rotor. If you already have the 732 housing, you'll have the 10-vane rotor (shown on the right with the fins installed). If you don't have the 732 housing, the 10-vane rotor is another reason to find one. They were used on all GM 700-R4s after 1987. Make sure that the rotor is not cracked or shattered.