About two months ago, the front axle would not turn unless I put it in 4wd and even then I could hear bad (grinding, clunking) noises. The trans shop told me there was no oil in unit and no obvious leak. One bearing had disintegrated, the other was still intact but was loose and showed wear. So I believe I did in fact drive for thousands of miles with low to no oil. At the time, the trans shop told me that there could be something wrong with the housing. They replaced the bearings and seals. About two months later which was two weeks ago, the same thing happened. So they are suggesting we replace the entire diff housing ... but they (new) are nowhere to be found. At least one specific to the PW. Even used, specific to 2010-2013 PW are rare.
I can only assume that only differences between a PW housing vs 2500 (other than gear ratio) would be external mountings. Does anyone know exactly what the differences are?