Ford F-450 Axle ID

[Preacher]

At work today we took delivery of a Ford F-450 Ambulance w/ Air ride.

I crawled underneath and noticed the rear axle had squared off axle tubes, a third member, disc, and serious mass. It is a spicer axle, but I've never quite seen one like this.

So without crawling back out in the rain to get the numbers, whats your best guess?

 

[amcjeepman]

Dana 135 I would guess.
13.5" ring gear

 

[Preacher]

I never even knew that model existed......!

 

[Aggressive1]

So when do we pull it

 

[scarface]

the ambulance versions had the 135, ones like mine have the D80