1998 Dana 60 fluid?

[Stelth]

I have a 1998 Ford E-250 with a Dana 60, non-limited slip. Tag says 3.76 gear ratio. I looked at a lot of information online, and I think that the gist was that I should use synthetic 75w-140 if I had either limited slip or 4.10 gears. For an open 3.73 rear end, 80w-90. Is that right? I have some 80w-90, and I'd just as soon use that as go out and buy more gear oil.

I recently got this vehicle, and I don't know anything about the maintenance history. I'm just changing fluids to make sure everything's good.

 

[Doog]

What does the owners manual say? with a 3/4 ton I would be likely to go with the 75w140.

 

[SwampSurvivor]

Looking at the owner's manual - that appears to be right.

http://www.fordservicecontent.com/Ford_Content/catalog/owner_guides/98ecoog1e.pdf

Unless you're going to be doing highway runs towing a lot, the 80w-90 should work. 75w-140 isn't going to hurt.

 

[Nick1994]

I'd use the 75w140. I just changed the gear oil in my grandfathers 96' Cherokee with a Dana 35 and I used Mobil 1 75w140.