Webley1991
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Series 2a and series 3 gear box's are interchangeable, it is only the feed to the clutch slave which is in a different place and needs to be changed.
That is not entirely true. The Series 3 gearbox has an external slave cylinder. The Series 2 type chassis has gussets on the under-engine crossmember which will foul on the series 3 slave cylinder. I learned this the hard way when I bought a galvanised chassis that had this gusset and had to modify it after trying to mount the engine/gearbox to the rolling chassis.
See this thread for photos:
https://www.landyzone.co.uk/land-rover/under-engine-crossmember-gussets-problem.268885/