After installing the new clutch that I purchased from Moss Motors it was time to slide the gearbox back in. While trying to line up the nose of the gearbox to go into the clutch it became apparent that the rear of the gearbox would not drop down due to the front of the drive shaft. After un bolting the rear of the drive shaft and allowing the drive shaft to drop down the rear of the gearbox could then be lowered allowing it to be lined up and thus I could push it home. Then I simply re-connected the drive shaft. None of the installation procedures in the manuals mention this simple but important fact.
By Gary Meckes