I'll post it here, since 385 series is where a lot of the C6s are attached.
Over in the 385 Engine forum, I have read where someone that has a BBF competitive monster truck (Big Dawg) uses only Mobil One 5w-20
synthetic oil in his C6 instead of tranny fluid.
It is almost a stock C6, in a very abusive situation and they have no problems with it.
Has anyone ever heard of this? I wonder why this idea has not caught on?