Just returned from my Oz trip, clockwise from Sydney to Darwin via Perth. Also suffered from input shaft bearing problems. My bearing gave no warning noises prior to it disintegrating and jamming the bike in 5th gear; 500 kms south of Darwin Much clutch slipping and the smell of hypoid oil dripping onto a hot exhaust.
Back-tracked 3hrs back to Katherine and shipped the GS to Sydney by road for repair; it was too damn hot (and expensive) to repair up in the NT during the wet season. Managed 16,000 Kms (10,000 miles) before it was 'game over'.