Rob,
There is a lot of discussion in the daily test results on the diff trouble & the efforts to overcome it. The end result seems to be the cooling system with the pump and the use of GM differential fluid available at that time. Both axles have limited slip devices. It is obvious that they went to great lengths to sort this out. One of the spare axle housings has 7 inspection openings machined into the casting & fitted with Plexiglas windows so they could observe what was going on inside in use.
I am sure you are correct on the advantages of modern oil meant for the job.
I also doubt that the vehicle will be expected to travel all day at 62 mph any time soon.
Jack
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