First off, I'm not qtiger.

Secondly, the gears in the transmission are most likely still fine. Not everyone is trying to build a race car here.

Thirdly, Quaife (only one 'f') does not make Torsen diffs. The Torsen company makes Torsen diffs. Yes they are similar in operation, but Torsen is a company.

Fourthly, a viscous limited slip diff does not have a clutch pack, it has a viscous coupling consisting of an impeller wheel attatched to the input and output shaft spinning in viscous fluid. Hence the name. But you knew that.