The same overdrive fits as for the four - the lever mounting bracket (RTC7164) has two holes for the two positions of the lever (four and six) as does the link rod (RTC7161), these accommodating the more rearward position of the gearbox.
Same advantages with the six as the four, quieter cruising (except this is often nullified by the noise from the overdrive), slight improvement in fuel consumption, and provision of an extra split for 3rd and 4th gear for maximum performance. In particular I often find Low range 4th + overdrive when offroad enables me to stay in low range where I would otherwise change into high range, just to have to stop in a few hundred metres to re-engage low range. Just make sure you do not use the overdrive in 1.2 or R, as it will not last long if you do.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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