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I checked my parts books and the truck book was not much help. The Mercury book was more specific however. You might be good to go according to it and the P/N in the truck book. The divining line was on the 4.55:1 ratio for the D41. The 3.73, 3.91, & 4.27:1 ratios all used the same carrier P/N 8M-4205-A when checking against the Mercury part numbers and the truck part numbers. The rear cover on the D41 was made for small carriers and the D44 rear cover was made for the larger ones. The Mercury cars, Ford wagons, Ford police cars, Ford sedan deliveries, and the F1 commercials all used the heavier Dana Spicer rear axles. The D44 was just a little more heavy duty than the D41 but shares a lot of internal parts. The case for the D44 is just a tiny bit bigger to accommodate more ratios. The Lincoln cars used an even heavier version of the Dana but they are very hard to find parts for.
With a pickup, I would prefer the 3.73:1 R&P so you could still easily pull a load. The taller gears will make it more difficult to do that. If you aren't planning on pulling a trailer or load the bed up very much, you might be OK.