Change the oil in the differential?
2001 gassser, Ford, 54000 miles. Recently my mechanic suggested changing the oil in the rear/pumpkin/differential. Said there could be rust in there...and it would be a good PM. (anyway). I've NEV...
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One of the first things I do with a a vehicle is switch all the oil to synthetic, good for a couple of MPG in cold weather, and replace trans and differential at 100,000 miles.
