I ran the Spec-R gear diff in the rear of my T3 with the atomic 50 mm ecs today. Car ran great all day. I had a little small leakage around the pulley the first run, but I didn't notice any after that (actually, I noticed the oil on the shock tower, and didn't see any on the pulley). This was on a tight low grip carpet layout with a 17.5/tekin with turbo set up. After about 4 packs or about 50 minutes of run time the diff still works and feels great. Very happy. I am running XRay 650 cst in it and I doubled up on the gaskets. I figure between 600 and 1000 XRay cst is the range of oils we'll use. Maybe 1500-2000 if used in front as a semi-locked diff/spool. I sanded the bevel gears with 1000 grit to make sure everything was smooth. Yay for maintenance free diffs!!
AWD