Had some slight gearbox related problems recently (occasional hard shifts and whining in higher gears) and it looks like It might be related to this:
Liquidized gearbox is not something I'd hoped for, and to be honest, I'm not too struck on dismantling another gearbox and messing around extending the input shaft again, so I dragged the old cossie box out of my mates garage.
Wasn't too happy when I found it was full of water which had leaked through the roof and filled it up, right to the seal where the prop goes in!
I pretty much expected it to be completely fucked, but once I'd cracked it open, I found absolutely no rust at all.... Result!
Gave it a good degreasing and blow out with the airline, then got the sealant out and set about putting it back together ready to get it converted to hydraulic slave cylinder