What type of rear differential fluid does the 2004 ford f350 use?

Differential oil is essential to lubricating the driveshaft and wheel axles in a vehicle. The 2004 Ford F-350 as a heavy truck uses a rear gear oil with a viscosity of 75W-140. The differential casing can be found under the truck in the middle of the driveshaft. The cover is fastened with fourteen 10mm bolts and the plug can be opened using a 3/8" drive. Examine the plug for metal shavings from the gears. It's installed with a magnet. A clean plug is a good sign gears aren't worn down. You should schedule service for a gear oil change every 30,000-60,000 miles in the F-350. Costs average $117-$215 in parts and professional labor.