rockfresh15

Ahh, ok thank you guys! This is my dad's quad so I'll have to take a crack at all this in a month or so when I'm back in town. How serious could it be in terms of what's causing it? Anything else I might wanna look into checking on the bike?

Hey all, I'm a 2-stroke quad/dirt bike guy, new to utility atvs. Just picked up a pretty clean looking 2005 Kodiak 450 4x4 with about 1,000 hours on it for my dad. The first thing I noticed when we got home was oil leaking from a seal on the rear axle. Pictured below. I've been staring at this frigan Partzilla diagram for days and can't figure out what part this is. What is it and what likely needs replacing/fixing? Also wouldn't mind any recommendations on the next things to check. The owner said nothing's been replaced on it but oil since it's been in service. Def needs new rear tires. Thanks all!