I found a nice little de-oiler at Jegs (part #555-52205) that works nicely as a diff breather filter. I sometimes overfill my front diff, and I was getting tired of it spitting out oil from the breather hose. So now I can empty it manually. :-) Also, it works nicely as an air filter. The OEM plastic cap was always falling off anyway...

 

Nice find I might just have to get one of those since I have the same problem from time to time