Hello I am a new member and I have a question about the shift shaft lubrication on my 2006 Rhino 660. I seem to have the classic worn gear problem on the shift linkage and when I opened the box I noticed the gasket and surface seem normal with no signs of oil leakage but also no signs of oil inside this box. I have been searching for a reason and only found one YouTube video that suggests oil is spashed in from the crankcase? There is a chromed plug on the top of this case so my question is should it have its own oil and has leaked out and if so what type and how much. There is nothing in the owners manual about this at all. Thanks!