I'm also running MTL. I have a 99+ cougar trans with a torsen. I want this discussion to continue because it is very intriquing to me, I don't want to ruin my new torsen. My trans supposedly had roughly 10k on it. I've put 5k on it with the MTL. So far so good tho. Also I took my trans apart myself and i dont see how the diff could get blocked from getting fluid.

A few more facts just to throw them out there.
When i took my trans apart (the one with 128K and shot 3rd synchro) the diff looked perfect. I put new ATF fluid in it when i bough the car. (98k) and then i put ATF+3 (112K-128K)



1998.5 Diamond White Pearl SVT (#4725) custom exhaust/intake k&N/mod'ed y-pipe slotted rotors/greenstuff pads/SS lines cougar trans/FSVT shift tower/Torsen 16lb. flywheel 18" Velox VX-8's with some rubba bands