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3n71b bellhousing

Chuck the old guy

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The 3n71b automatic  transmission in my 85 720 is getting tired after about 300,00 miles . I have found a low mileage (64,000) replacement transmission in an 86 d21 with a v6 in it.  My question is "Is there a difference in  the bellhousing behind the v6 and behind my NAPZ engine? "  I  know these are separate bellhousings which bolt to the transmission but I am curious? 

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The D21 will have an L4N71B possibly an E4N71B which is heavier duty. It's slightly efferent length and is a 4 speed automatic with overdrive. The bell housings as slightly different because they bolt to the OD unit.


L4N71B top and 3N71B bottom. Both are L series but Z would look similar



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