Phil...
I can't say forsure what size the rear axle is as I haven't had the cover off of one and I have been burned before trying outguess GM. You pretty much have to go by the Bill of Materials code stamped on the top of the axle tube to be sure. I do know that AAM makes quite a few components for GM and if you look at the castings such steering parts you will see AAM cast in to them as well. I also know that the front and rear differential share alot of components such as bearings and Eaton tells me the front and rear lockers share alot of parts also.
I am getting ready to see if what Eaton told me is true as I have to look at my front locker. It didn't work last time I tried it- shows to have a open in the stator coil assy. Its either a broken wire inside the housing or a bad coil. I couldn't order a replacement coil from Eaton (backordered) but they did tell the rear coil is the same size. Only difference is the bracket that is tack welded to the front coil. I ordered a rear replacement from Hummer and will let you know if it fits with the modification.
Don
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