Hi I have refurbished an aussie top loader using parts from Davidkeestoploaders in the states. check out 4speedtoploaders.com I replaced all synchros, bearings-(race series bearings), 2nd and 3rd gears, and more. The quality of the parts are exceptional. It took only ten days to arrive from dallas/texas to tasmania. The cost was half of what you would pay in aus. It also came with detailed D&A instructions. As for doing the job yourself you would need some gearbox rebuilding experience. Cheers richard.