all you guys posted and not a one of you steered towards the tech articles and their writeup of eaton roots style superchargers?
Under the "Engines" section of the tech articles there are 5 articles there, 4 are for the 4.0, the first one Eaton M62/M90/M112 has some good info...
DISCLAIMER: Activities and vehicle modifications appearing or described at The Ranger Station and it’s pages may be potentially dangerous. We do not endorse any such activity for others or recommend it to any particular person – we simply describe the … Continued
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Ford Ranger owners have increased the horsepower of their 4.0 OHV and 4.0 SOHC engines by adding a supercharger. Currently there is only a kit out there for the 4.0 SOHC engine, and you need to provide your own supercharger. … Continued
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the biggest issue I would think would be either cost if you just want to buy it or how unicorn it would be if you want to scour junkyards hunting for it.