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i belive the mounts are the same except for that the 73-76 3/4 ton 4X4's had a narrower frame, but the 73-79 1/2 tons 2X4 & 4X4, and the 77-79 3/4 tons 4X4, 73-79 3/4 tons2X4 have the same mounts.
Scott
mickelsons(No Email Addresses In Posts!)
I don't know what the difference might be, but Whitney has two different part numbers for 2WD's and 4WD's in their catalog ('66-'79 F100-350)...same price for each set though.