Maybe this tops the ML7 I found earlier?
http://www.ebay.co.uk/itm/myford-super-7-metal-lathe-gearbox-/120814004612?pt=UK_Home_Garden_PowerTools_SM&hash=item1c21136984
Tony
http://www.ebay.co.uk/itm/myford-super-7-metal-lathe-gearbox-/120814004612?pt=UK_Home_Garden_PowerTools_SM&hash=item1c21136984