Hi all: I just made a deal on an r75/6 in pretty decent shape- except it has a blown transmission. I have no confirmed info on how bad the insides are, but from the riders description of grinding noises and power loss I expect its pretty bad. What say you gurus of cyberspace? Do transmissions from other years/models mount up easily? are there specific years with better ones- should I rebuild this one or get a more robust one and build it up? Frankly im tempted to just buy a used one on ebay, slap it on, and hope. this is because i have a 2 year old and a very busy work schedule.. so the avenue of least time is good.