Which rear differential oil is currently recommended for 9.75 inch standard diff on 2001 Ford Expedition

originally, Ford recommended 75W-140 synthetic. My Ford Master Tech. Friend says it is better to use 80W-90 regular diff. Oil because 75W-140 gets too thin in use. Have you heard of this? Which do you recommend?

by in Issaquah, WA on September 27, 2013
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1 answer
ANSWER by , September 27, 2013
The safe bet is to go with the factory reccomended fluid.