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Look what I found rolling around my basement. Well I knew it was down there. Fan itself measures about 16 inches. Shroud is 21x23. The Expedition radiator core is 19x27 so it should cover pretty nicely. Or I could trim the fan shroud to fit the Expedition's shroud. Not sure which way is easier/better?
One uncertainty is the fan has 3 wires so I'm not sure what the extra wire is for? Maybe a low speed/high speed? I think it's from a Durango or Grand Cherokee but I honestly don't remember.
And I've got the differential bug I think. Can pick up a used rear 3.31 for $200-300 and front for $150-250. My generation Expedition never came with a 3.31 front end so I am looking at a previous generation. I think the axles will bolt up to it but I guess I will cross that road when I get to it. Or I have to splice axles together.
I think I will start by changing just the rear and just keep the truck in 2wd and it should be fine. Anyone know for sure? Certainly don't want to roast the transfer case. If that goes well I may drop down to a 245 70 17 tire which should be approximately 1 inch smaller in diameter so 1/2 inch lower ride height. Then if I do the 2 inch lowering springs my ground clearance should still be 6.5 inches.
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