I know that only the LII axle specified 75W140 so that tag can be used to ID the axle but what part of the

N313L
4L10 88 3E15

tag IDs it as a LII axle. The only thing I can read out of that is 8.8 axle 4.10 gears & Limited slip

 

I can't decipher it either. I was just posting it for comparison to anything that might be found on the 03 FX4 Off-Road axle.

It's not likely that you would find a LII axle on a non-LII by mistake. Ford usualy builds specific packages in batches to cut down on misbuilds and increase efficiency.

Here's an easy check that can be done without referring to axle tags or markings. Go out and measure the diameter of the axle tube near the u-bolts. A 31-spline Level II axle is about 3 1/4" and a 28-spline is something like 3".

If you don't have a caliper or micrometer handy to measure the diameter, wrap a string around and mark the circumference. Then transfer the string measurement to a tape or rule.

A 31-spline should be about 10 1/4"
A 28-spline should be about 9 1/4" ~ 9 1/2"

 

OK, I misunderstood your prior post

That part threw me off. I was just curious what the rest of the tag stood for. If you could tell the data/location of manufacture, spline count or any other info from the tag. I think I'll check my 28-spline today just to see what it says.

 

Axle tag on fx4 reads

V33K
10882L13