The oil capacity of a 1996 Ford F-250 rear differential depends on the axle ratio and whether it's a limited-slip differential or not. There's no single answer. You
must consult your owner's manual or a Ford parts catalog specifying the axle code (found on a sticker usually located on the driver's side doorjamb or under the hood). The axle code will help identify the correct differential and its capacity.
Without that information, any capacity I could give you would be a guess and potentially lead to overfilling or underfilling, both of which can damage the differential.
