Hello Evan, thanks for your detailed reply. My 165 parts book is dated 1/74 so perhaps you have a later one showing the additions. Bepco list another shear tube for the 165 30/330-4 1680 189M1 but the size given is 57x97mm opposed to the 54x127 for the 880 070M2. So a big difference on that one. 880 069M2 is listed for 133-148 and comes out at 54x127. Differences, but enough to almost rule out incorrect fitting. As mentioned the tractor has been un-MP'd so a degree of rebuild must have taken place in the gearbox. Agreed, the 886 366 m91 fits all. The pinion nut is slotted and tabbed. There is no mention in my book of any other type. In fact as the pinion was 'free' but not loose I have tightened it one 'tab' to replace a little of the preload. Axial pinion mesh with the crownwheel is perfect. The tube is in contact with the pinion nut. The second thread is just visible, so all appears well in the back end. Interesting theory on the bearing and circlip. As far as I can see the ultimate position for the rear main shaft will depend on the position of the gearbox main shaft. Assuming that the circlip has been replaced on the front of the gb mainshaft then its position is fixed. Perhaps a gentle tap forward on the gb main shaft might reveal something. Once again thanks for your help. Will let you know if I find anything. Regards David
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