What year wagoneer did your axles come from? Is your 79 CJ Quadratrac?
If I'm not mistaken, the Wag axles are 58" drum to drum. They really aren't that wide looking under the jeep. A buddy of mine swapped 79 Wag axles into his 76 CJ-7, it turned out pretty nice. The bolt pattern is a bummer if you have already bought nice rims.
Except for 1986, the widetrack CJ axles were the Dana 30 front and the AMC model 20 rear. "Modern" Wagoneer axles were the trusty Dana 44 front and rear until 1980 when they switched to an AMC20 in the rear and changed the front diff to the driver's side. The Wag axles are stronger even after they switched to a model 20 in the back because it came with one piece shafts where the CJ model got tapered two piece shafts.