Posted: Dec 08 2008 at 1:49pm | IP Logged

Danny, use Mobil 1 75W-90 in your C-200 axle.  I have one and that is what I use.  Take the fill plug out before the drain plug just to make sure you can add fluid after draining.  The fill plug takes a gary silicone goop to seal it.  I used Teflon tape on the drain plug but you could use the gray goop as well.  The front diff and transfer cases on 4 wheel drive have those once and done washers.  I assume your 2 wheel drive rear is the same as my 4 wheel drive rear.  They are both C-200.

Since there are plugs, you don't need to remove the diff cover like in a Chevy 10 bolt rear to drain it.  Our axles use an RTV instead of a gasket, btw.  Crawl under and find both the drain plug (very bottom of the diff) and the fill plug midway up on the cover).