I just got off of a 2000+ km journey with my newly purchased Patrol. It was shifting smooth as butter the first day I had it, and I was grinning ear to ear. But on the second day of driving, I noticed the shifting seemed noticeably "crankier". Instead of shifting smoothly between gears, it began to take some careful articulation, especially between 2nd and 3rd. Which is fine, but just not nearly as enjoyable.

How do you keep the GU's 5 speed transmission shifting smoothly? What kind of maintenance is required?