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I had a '97 F150 which needed a differential rebuild once in the 70,000 miles I had it (using stock lube). I then bought a '99 F250 w/ 10.5 ring gear differential. I was commuting with it-all mild flat freeway- and swapped out the fluid to 75W90 thinking my situation was easy on it. I did tow about 5K miles in 110,000 miles. Well....that differential was screaming loud at 110,000 miles and needed complete overhaul. I had changed the fluid to Amsoil synthetic at about 20K so the lighter than spec fluid was in 90K.
I've owned a lot of vehicles and very rarely had differential problems. I will never be tempted to use lighter than spec gear lube in any Ford products again.
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