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That is a Full Floater rear end. All E 350 passenger models with Advance Trac / RSC got that axle.
Its a Dana 60 with 32 spline axles. If you want some kind of traction aid in there, your choices are limited, all I've found that will work without changing axles is the stock TracLoc, Lock Right lunchbox stole or the ARB locker.
Way back when, all 3/4 ton - 1 ton vans, and even trucks all had full floaters, but then they started making these "light Duty F250's and E250's) and now even light duty E350? Like come on! I've seen a couple of newer Ford Diesel Ambulances in Florida fueling up, and one was missing one of those cheap ugly plastic hubcaps at the back, and it had a semi floating axle?????? I was like WTF? Really? Where has that old Built Ford Tough gone to?
A semi floating axle under a Diesel ambulance? Really?