Originally Posted by ahicks
You're disconnecting the drive shaft? Why?
Well, there are two schools of thought in the MG Community. With The Driveshaft connected the rear output shaft would be turning. At least in the Late model B's it has a helical groove in it that causes the oil to be fed to the bearings and layshaft as it turns -- sort of an Archimedes Pump -- called a slinger been around british cars forever. However some in the MG community say without the input shaft turning to further churn up the oil there may not be enough to keep the layshaft bearings lubricated enough. On some transmissions there is an oil pump on the input shaft, and on some there is one on the output shaft.
I do most of the work on my MG myself, but I have a garage here that I get most of my parts from. I have known the owner and his chief mechanic for over 35 years when we were all active in road racing. His head mechanic, who has forgotten more about british cars than I will ever know, says on the late model B's it shouldn't be a problem. Its a minor point, but the conservative approach says to disconnect the drive shaft on the differential side. There are only 4 bolts and lock nuts. In anticipation I have an extra set of bolts and 12 nylock nuts in the boot. You can not install the driveshaft out of phase, as the holes in the coupler are offset so the worse you can do is be 180 degrees out, no biggie, and a punch and white paint fix that.
You could just let the drive shaft flop around nothing will get hurt, as there is a pan welded to the frame about 2-3 inches below where it normally rides that will support it. Just to be on the safe side however, I will bungee the drive shaft to the battery box frame about 18 inches away just to keep it from flopping about. That is the conservative approach... but it is nice to know that if I need to I should be able to tow the car with the shaft connected. I'll just set a 35-45 MPH / 10 Mile personal limit to that.
Roadmaster makes a drive shaft disconnect, but I am not sure how well it will fit the MG. Something later to investigate.