The '79 will most likely be a 10 bolt, although it could still be a Dana 44. The '70 axle will have the smaller 260-X steering u-joints, which means that if you want to swap to the bigger joints, you would have to swap the inner shafts also. The inner shafts from a 10 bolt are 28 spline, and they will not swap with the 30 spline Dana 44 shafts. If you just swap the spindles, hubs, rotors, brake backing plates, calipers, and lockouts, and leave the shafts alone, everything should work.
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Tim
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