We seem to have a gremlin running around a 4650 with a Quad Range. At times It comes out of Park in a normal manner. Other times it is challenging and doesn't want to come out of Park. This is all while on flat ground. Doesn't seem to matter what is hooked to the tractor either and the problem is never consistent. This tractor is the planter tractor and has 18.4x38's on the rear.