he is referring to the 8.8 under Explorers. the 8.8 was a popular axle under many fords, but the explorer one has the right bolt pattern and width is close (5/8" narrower per side than stock Jeep axles). 3.55 and 4.10 ratios are common and 95+ have disk brakes. also, the v6 and v8 explorer axles have different part numbers, but they are the same inside.
car-part.com can help with finding junkyard axles. :thumbsup: