I've torn down the gearbox of my WR426 (after losing 5th gear) and have just got the parts list and prices back from the dealer. One thing that stood out for me were three or four washers that sit on the gear shaft (both pinion and wheel shafts) between the gears. They're quoted as around the $13 - $14 mark each and there are four or five of them. I know i'm probably penny pinching, but if I can save some money here and there I will. For anyone who's torn down their gearbox, did you replace these? Is it necessary? I've had a look at them and they don't look worn. They're not normal washers, they're got teeth on the inside that allow them to fit on the shaft.