Well, rather than rely on "axles used on GMT 900 trucks and SUVs".... Which is a rather vague statement as there's a few different options available, there is no one size fits all. Actual measurements with a micrometer are necessary. When I did the axle bearings on the 2014 Escalade, the below bearing was too small for the axle tube. RockAuto did not differentiate between the 8.5 in 10 bolt and the 9.5 in 14 bolt rear end. I just assumed all escalades had the 14 bolt. Note the outside diameter on what turned out to be the axle bearing for the 8.5:
.... So ordered the correct AAM bearing kit, and it fit perfect. Note the outer diameter of the bearing on the 9.5:
That is actual part numbers with actual dimensions, from both timken and AAM, the latter of which uses koyo bearings.
There's even a late 2014 change in the available rear ends used.... If I remember correctly it's a 9.5 inch differential with a 12 bolt cover. Stumbled on that while looking over specs at the local dealer. I've never seen one though.
I will put on my chrometer on the outside diameter of the axle tube on Saturday for one more measurement out of curiosity.
But to say your basing it on axles used on the GMT 900 platform is like saying all GMT platforms have an LS engine so they all share the same parts... Which is far from accurate.
On a side note, both the 8.5 and the 9.5 inch rear ends have been around for a couple decades. They're having fact been various changes along the way. But the bottom line is that the 8.5 was originally designed for midsize cars, and GM never should have installed them in pickups and SUVs..... But they did.
