I have a MT trog on 2002 HD road glide started to get a whine in the rear on the left think it's a outer axle bearing. does anyone have a cut away of the rear end or a manual for serving the trog. I know it's based on the 7.5 ford rear end but i don't see a way to drain or add fluid. if anyone wants to convert from drums to disk the wilwood 950-140-11403-DR kit fits ford small flange rear ends