580CK Trans issue

[CrazyRay]

Hi everyone, somewhere in the past I read a post here about rear axle fluid getting into the shuttle trans. If I remember correctly someone mentioned a plug or cap that was installed by the factory that fails and allows this to happen. If this is true where can I see and check or repair it. I believe I have rear fluid in trans as the fluid is thicker than HY trans. Of course, I am going to drain it and figure out how this happens. What would be the appropriate way to flush the trans and shuttle clutch before changing filter and refilling. This is a new tractor to me...so I don't know how this happened. Perhaps someone in the past put the wrong fluid in it. It has the classic very long warm up time before it moves. Thanks, Ray