1978 3/4 ton to 1970 3/4 ton axle swap question

[ReeseBobby]

I'm preparing to swap out the axles in my 1970 3/4 ton leaf spring truck. It's got 4.56's and I'm looking for a little better highway travel. I've got a line on a set of 1978 3/4 ton axles in 3.73. Its a 14 bolt rear and Dana 44 front.

My question is: will these years easily swap? The front axle also has a flattop steering knuckle and fabbed crossover steering arm. He also has a factory arm available. This would be my first swap and I'm worried about wasting time and money on non-working parts. Thanks!
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