Installed new (to me) 02 WRX limited slip differential with my MY98 pinion gear into the MY98 rear differential case, installed bearing caps, checked lash, put rear cover on, filled with fluid, installed axles, lifted back into place, bolted all together, installed lateral links and other suspension bits removed earlier and torqued the axle nuts down. All I have left is to install the cat-back exhaust and fire the car up to test things out. Everything turns nicely, no weird noises or grinding, lash checks out perfectly and I'm excited to have finally put a LSD in the car.