The Lift-All reservoir on my '46 M was leaking oil, so I took it out to replace the gasket and do a proper job of sealing the fittings. Figured while it was out, I should replace the transmission drive shaft and countershaft oil seals.
The drive shaft coupling won't come off because there's not enough clearance to slide it off the shaft until it bumps into the clutch shaft. The reprint service manual I have suggests you can remove the clutch shaft after unbolting the clutch release sleeve carrier. Not in my experience! Now I have the opposite effect - the clutch shaft bumps into the transmission drive shaft coupling before it clears the splines on the flywheel.
About the only thing left to do is unbolt the clutch itself from the flywheel. I'm just wondering whether this will do me any good, or if I still won't be able to get the clutch shaft clear of the transmission drive shaft coupling.
This is starting to remind me of the bathroom project we did last year. We needed to fix the floor under the toilet, and by the time we we done we had taken the whole room down to the studs.