It brings up Dexron III but in the new package(since 2006)
That MANUAL TRANSMISSION AND TRANSFER CASE (not to be confused with a synthetic newer fluid sold by GM under similar wording) fluid is Dexron III
Go buy one, its even dyed red. Flows like ATF. Is ATF. The SDS I even scoured a modern one jsut to check, and its still mostly a petroleum byproduct and red etc
Oreillies offers several jugs of fluids that say DEX (or DEX III) and Mercon
But Dexron III is no longer policed, anyone can put it on their label, and Mercon (original) is no longer made, period, but Mercon V is fords replacement which is policed unlike mercon. that being said, Ive used that valvoline in my e4oD and my 4t65e. Worked fine.