Definitely is greenstar ready. Just need a display bracket and roof bracket. If it didn't have the JD autotrac valve then it would need to be added IF you wanted integrated hyd steering. 

You could also add an ATU instead which is on the steering column. They do pretty well in those machines. But it depends how fast you're going, how perfect you need the passes. ATU 300 is the steering wheel motor and I'd give it a B+ in those tractors for how well it does. ATC 300 is the hyd controller if it has a trimble valve from your previous adventures. Then you'd be at A+ steering system