My 123 developed a leak from what seemed to be the gasket between the transmission and hydro unit. I have split the tractor and cleaned up 42 years of under-frame crud. I've ordered the various gaskets/seals I think I'll need. The hydrostatic ran perfectly.... only the leak. I'm thinking it's better to leave well enough alone and simply replace the gasket. Make sense?
I read on another thread about continued leaking after replacing the gasket. Can anyone provide some experience on this issue? Proper torque requirements. Any other issues?

I'm experiencing the
'one thing leads to another' syndrome. I've replaced the worn steering unit, replaced all the ball-joints and the sheet metal is on its way to be sand-blasted.
Thanks for any input on the hydro question......