torsen diff and truetrac are the same thing in engineering speak. the ford racing install kit has excellent bearings in it. My install was straight forward, but, see if you can find a case spreader to use before you tear into it.
issues are bias is very high in both. quite often noticeable when traction is limited by ice/snow/muskeg and the operator has made the mistake of turning the anti-skid system OFF during anything but straight line driving. Oh, ask me how I know that! It's true the anti-skid and the torsen don't care for each other, but it also doesn't care for a limited slip diff, either. and a solid spool on the street is not just ridiculous, it's dangerous. I drive up in the Rocky Mountains with it, so my experience with the torsen would be different than someone who drives in, say, kansas. Got a guy here who says he put 4.56 gearset into his car. I let him drive my 3.73 gears. he's going to swap his out again to 3.73. his was quicker, but is almost undrivable in the winter here. maybe a 4.10? don't know. one thing, I won't be going back to the open spool anytime soon.
It's really important to have the ride height set to factory specs. I know, scraping the rocker panels on the gravel looks cool but the car's suspension isn't designed for it and high speed cornering suffers. learning from others errors is cheap.