What oil do I use for rear differential on 2002 Ford E350 Econoline van?

The recommended rear differential oil for a 2002 Ford E350 Econoline van depends on the type of differential it has. Ford E-Series vans from that year could have several different rear axle types (e.g., 7.5", 8.8"). You MUST check your owner's manual or the sticker on the differential cover itself. This sticker will specify the correct type and weight of gear oil.

However, if you can't find that information, here's what you should do:

1. Identify your differential: Look under the van. The differential cover will usually have a tag or casting number on it. You can use this number (or pictures) to search online for the correct fluid.

2. Check the owner's manual: It should list the recommended gear oil type and capacity.

Without knowing the specific differential type, I cannot give you a definitive answer. Using the wrong oil can severely damage your rear differential.

Once you find the correct differential type, you can then look for the recommended viscosity (e.g., 75W-140, 75W-90). Many auto parts stores can also help you identify the correct fluid based on your van's VIN.