Rebuilding my gearbox...
In my 1974 after GASP! only 30k miles due to severe abuse on my part and most importantly excess use of the kickstarter by the former owner which got little metal bits into the bearings. Actually the bearings weren't to bad I figured since I was in there to replace all the leaking seals I might as well freshen it up. Well lets add that to the 74's bad rep,the transmission seals dry out and leak after only 38 years! But seriously nothing wrong with these bikes, maybe the trans has a higher re-build rate than other airheads but that doesn't make it unreliable by any means.
If I can't fix it I'll make sure no one else can!