2001 Ford Expedition Q&A

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

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? -
Answer 1
The safe bet is to go with the factory reccomended fluid. -