Spent the day stripping down the gearboxes and overdrives. Overall this was relatively easy job and the only difficulty part was dismantling the gears on the main shaft. The problem was the shaft from the Type 5 gearbox was too long so it was impossible to use a bearing/hub puller to remove the bearing so the individual gears could then be removed. To overcome this the only option left was to pop down the local machine shop and use their hydraulic press (cost me a fiver). Once the gearboxes was stripped I gave the items a quick clean so I could check the condition of the parts. The parts will still need to be cleaned more thoroughly before I can start reassembling.
The selection of parts can be seen in the photo below, hopefully I can remember how it all goes back together!