Look forward to hearing what you find. Take care not to lose any shims (little thin washers) that may be on the ends of the drive shafts and make sure you note where they go for reassembly. While you are in there have a look at 5th gear (the little one on the end)as this can start to fail on these engines - you'll see pitting on the faces of the teeth, maybe even with bits of metal or even part of a tooth missing. All parts that rub together should be shiney but not scored or damaged in any way.
worn dogs will be fairly clear too, look for rounded tops - there are more than one set so compare between different cogs to get an idea of what's normal and what's goosed.
It's easy when you're in there don't worry about pulling it to bits. Try and pull the whole cluster of gears/selector drum in one lump but no probs if it won't come out like this. Dump it on the bench and keep everything in the right order and orientation. Although it'll only go back together the right way it can be a bit of a struggle guessing what goes where if you just tip all the bits in a box and come back a week later to try and figure it out.
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