Great photo, as already mentioned
As for the gearchange, see my flush-and-fill suggestions in the recent thread 'My new gtv but got a couple of problems'. I would provide a link, but can't figure out how to copy and paste in the Internet channel on my Wii - I'm typing this with the Wii remote by clicking keys onscreen
More additives are allowed in automotive gearbox oil than in helicopter gearbox oil. These friction modifiers often help syncromesh engagement to be more progressive. It's worth giving additional additives a try before stripping/rebuilding the gearbox. Note the EP sludge issue I mentioned which may need flushing out; probably why aviation engineers avoid additives?
Speedometers often over-read by about 10% but odometers are usually accurate to 1-2%. You can check this against a GPS too (they are very accurate on flat ground only).
Check the toothed rings (or on later cars, the multipole magnetic codifier rings) on the CV joints and rear wheel bearings, brushing away any debris.
Check the brake discs, especially the fronts, for runout. I do this by removing the pads and holding a pencil against the caliper carrier - it should of course mark the disc most of the way around.
Keep us posted on how you go, I'm sure you'll have it sorted.