If it has the clutch slave cylinder on the left, mounted directly on the bell housing, it is a Series 3 box. If the clutch slave cylinder is mounted vertically outside the bell housing, operating a clutch cross shaft via a bell crank, it is Series 2/2a.
(I is probably possible to assemble a box with a hybrid assortment of bits so that this test does not work, but I have never seen or heard of one. Right at the end of 2a production a small number of home market station wagons had a Series 2a all synchro box with the slave cylinder on the left, but this is close to a Series 3 box anyway.)
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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