When my tcase went south, it started eating speedo drive gears. After the 2nd one was destroyed I dumped the oil because there were metal shavings embedded in the plastic gear (I guess I'm a slow learner because there were shavings in the first failed gear too). What came out of the case was chunky. When the case was pulled apart, it looked like a grenade had gone off in there.

It was the perfect excuse to pick up a rebuilt case from Jim at Inchworm with 4.7 gears in it. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Hopefully your tcase problems aren't that extensive.