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Thank you, I think I am going to go ahead and run ATF since everything is fresh at this point.RDUKW...Try these guys http://www.dionandsons.com/lube_s.htm for your supply point. They are in Long Beach near PCH/710. I looked high and low for 50W for my Spicer and they had it. So, I'd imagine they can help you out with your tranny fluid.
http://www.sprucemtsurplus.com/grease-oil-sealant.html
Spruce Military Surplus sells the 5 gallon OE/HDO 10 ; nsn 9150-00-136-6668 $50
See item Oil 19
Ran across this today while ordering from them if it will help anyone out there who can't find it.