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					Originally Posted by  Phil Waterman
					 
				 
				 Think about which gear is closes to the filler hole. 
			
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 Having just looked at a Chev gearbox from the outside and discovered the filler plug is on the rear face of the housing, offset well to the RHS and located on a bulge in the casting, the answer has to be reverse gear.  That is, reverse idler gear would blank off the filler hole in neutral.  Quite poor design IMO.