Yes on Eaton, looks to be an HO72, image of the front of the differential is not the best. Really, all you need is the differential. Now, if you plan to go to a different transmission and a one piece driveshaft, then it'd be nice to have his drive shaft. However, not sure but it may well be a two piece.....but if not you might be able to have it modded to work in your truck.
If I've overlooked anything with my advise I'm betting someone will chime in. This is a pretty easy/common upgrade.
Here is my report on changing to 4.10s in my 3600 earlier this year.
Added in edit; just a thought but you might ask the seller to include a few of each (or all) the fasteners removed while pulling the differential. It wouldn't be unusual for some of your 48's to need replacing due to rounded shoulders, buggered threads or such.
Good Luck, RonR
