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Originally Posted by JIMs70GMC
Like Adam said, the axles will bolt right up. I was under the impression that the late 72 axles got the larger u-joints as well as 73 and up. The dana 60 appears in the late 70s under 1 tons. Steering correction is the same, i.e. raised arm or dropped pitman arm they are the same, 70 through 87 or 91(truck-suv).
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I'm not positive of the date of change over but I kniow for a fact that it happend by 74. I have run across a few external hub 8lug D44's on 73's in junk yards. By 74 all were the internal hub so again another vote for that because it's easier to get parts for. Every Advance is going to have Warns that fit.
Any solid axles from a 1/2-1 ton up to 91 will bolt right in. I have heard that the 10 bolts from 78 up run larger wheel bearings so that might also be somethign to look at. The down side of the 10 bolts is no flat top knuckle if you want to do a cross over later.