[bilfman]

Just clean off the surfaces well with a wire brush, wipe clean with some brake cleaner and seal up with a healthy bead of silicone. I like permatex ultra grey.

Smart move on the 10-30 lotsa peeps put in gear oil in the 203 and burn em up. I prefer plain 30 over the 10-30.

Also a great tip if you have converted the 203 to a part time. There is oiling issues because the 203 is designed to be spun fulltime. So if converted to part time engaging it every 100 miles or so was the answer. I had an ol guy at a tranny shop tell me a tip that eliminates the need to engage the t case or hubs. Just get a 1/2" 90 elbow, a 1/2" 2" nipple and a cap. Extend the fill hole 2 inches higher with the elbow and nipple and then cap after you fill the case. Basically this just fills the case with about another 2 1/2" of oil and it keeps everything lubed without having to engage the case. I did this on mine and never had an issue.