In order to brand an oil as Dexron or Mercon, it has to meet the minimum specs for those products. If a fluid happens to meet the specs for both, then it can be marketed as both. I suspect the viscosity requirements for Dexron and Mercon are close enough that it's possible to meet both specs with a single oil. Then it becomes a matter of using additives such as friction modifiers to meet the other requirements.
Back in the seventies, the specs for the original Dexron and Ford Type F were quite different, as were the transmission designs of the two manufacturers. These days, Ford and GM actually collaborate on transmission designs, so it's only natural that their transmission fluid specs would be very similar.
As for synthetic gear oil in the differential, GM specifies the use of synthetic gear lube in its locking differentials, rather than using friction modifiers and frequent oil changes as in the past. Definitely use synthetic if you have a locking rear end, and it sure can't hurt to put it in a non-limited slip differential.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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