Here is what a 8.5, 10 bolt rear end looks like. Look close. You can see 2 ears hanging off of the bottom of my diff. All 10 bolts have these ears, at least in these trucks, anyway. The 1500, most likely has a 8.5, 10 bolt, and the 2500, a 9.5, 14 bolt. It is a very bad idea to take parts out of 1 rear end, and put the in another. There are precise measurements involved to set pinion depth, pinion tention and ring gear back lash, and spacing. I rebuilt my 8.5, 10 bolt, I Put an Eaton trutrack, a set of Summit Racing 373 gears, all new bearings, seals, a crush sleeve eliminator kit, and I got the install kit from Summit also. It cost me $1100, but that's with me doing all of the work myself. In the 2ed pic, you can see where I broke the 10 bolt, carrier bearing mount, off of the carrier, itself. You can count the bolts on the carrier. There are 10, and that's why it's a 10 bolt. Although the cover also has 10 bolts, that is not what makes it a 10 bolt rear end.
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