Thanks for all the info!
The main reason I am replacing it is because a bearing is dying. But as I stated before also I'm wary to rebuild because of the oil that leaked on it. Maybe if I tried to rebuild I could hose it down with a couple cans of electronics cleaner to clean it up?
The rebuild kit sounds like a great option... I'm not afraid to do that kind of thing usually. Might do that on my work truck.