i think it takes the rotational forces from the engine and converts them into hydraulic pressure. i think the inside of one resembles a paddle wheel that moves the hydraulic fluid.....gimme a sec...

How TC's work link

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-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto