It's a 1990 E350 cutaway van motorhome, 27-foot, with a 460 V8. The tag on the differential (what I could make out anyway) says:

First line: 4.10 *F0

There was a downward pointing triangle where I have a star, and I am not sure if the last character is an O or 0.

Second line: 605421-2

On the pumpkin casing is what appears to be: D5AOD
And on the casing web (between pumpkin and axle hole: 70-2U

There was one other thing on the casing, but I couldn't make it out.

I need to know what weight axle lube to use. Hoping to use Redline.

Thanks

 

85-90 gear oil

 

Thanks FordPerf300. I went back to the owner's manual and the 70-2u seems to relate to the Dana 10.5" (M70-2u). The Ford gear oil spec for the Dana 10.5 is ESW-M2C105-A (part no. C6AZ-19580-E).

 

85w90 but does this need to be special heavy duty truck type gear oil or only passenger car type?

 

You could run a severe duty oil, check out redlines website to see what they have for gear oils. If they have a heavy duty oil you could get that for extra protecton but i doubt it will be necessary..