Re: D478 manual transmission identification and options
			 
			 
			
		
		
		
			
			Not sure if this would help, but my 478 Gas had a 5-Speed Clark.   
 
I doubt a Toro-Flow would have an SM-420.   
 
Also a Toro-Flow was a Gas Engine that was made to be a Diesel.  Should be the same Block to accept a typical trans.
		 
		
		
		
		
		
		
			
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				Drove and owned many, but some of the more interesting ones were: 
 
-'60 GMC 2500 Dump, 305 V-6  
-'62 GMC 4000 Flatbed, 305 V-6 
-'62 GMC 6500 Flatbed Dump, 478 V-6 
-'67 GMC 7500 Box, 6V-53 Detroit 
-'71 GMC 9500 Flatbed Dump, 637 V-8
			 
		
		
		
		
		
	
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