75-140 synthetic
i believe three qts. and it uses 80w90 or 85w140 either one is fine
http://www.guzzle7pt3.com/rdiff.php
The fill plug on the rear differential of a 2001 Ford F250 is typically located on the differential housing itself, near the top or side of the unit. It is usually a hex or square-shaped plug, which can be accessed with the appropriate socket or wrench. To fill the differential, remove this plug and add fluid until it reaches the bottom of the fill hole. Always check your vehicle's manual for specific details and torque specifications.
drawing for bearings and seals of front differential axle
For a 1992 Ford F-250, the recommended fluid for the rear differential is typically 75W-140 gear oil, especially for models with a limited-slip differential. If the truck has a standard open differential, 80W-90 gear oil may also be used. Always refer to the owner's manual or a service guide for the specific requirements based on your truck's configuration. Additionally, ensure to check if a friction modifier is needed if a limited-slip differential is present.
I found somewhere that the 1973 Ford F250 Ranger XLT with a longbed and 390 V8 has an unloaded curb weight of 4,500 lbs.
Every 30,000 miles
The 1994 takes Mercon transmission fluid
The 1991 Ford F250 extended cab pickup truck, with a V8 diesel engine, curb weight is listed as 4620 pounds. The curb weight includes all of the fluids
26.4 pints or 11.2 litres
( 3 ) according to the owners manual
Motorcraft MERCON ATF ( automatic transmission fluid ) according to the owners manual