Just for you;

https://www.youtube.com/shorts/PfKwIWa0CxQ?feature=share

Don, I found your steps;

https://www.youtube.com/shorts/PfKwIWa0CxQ?feature=share

Oh, man

That is massively cool!

Tate,
Thanks for that update.
My takeaway is that Mopar is doing their homework and installing some stout components. That, and now we know for sure that we are back to clutch-type limited slips.
Another takeaway is that this newer carrier is going to be a tad bit more difficult to play with given its pressed-together nature.
I for one will just run this factory setup until Trump leaves office after he completes his second term in 2033.

And then I started to install the aluminum diff cover

But wait, the bolt holes did not line up.

And the gasket looked different

And the whole thing was smaller than the steel cover I just removed.

Ya, the thing did not fit. I got $300+ for the new cover and $105 for the fluid; all I got was a fresh fluid change for the axle. Now that may not be all that bad, since axles break in, and changing the fluid afterward is a good idea. So I'll take that much, but No one, including the people who sold it, said anything about this 12" AAM has a bigger cover.

Why did they do that? A Dana 60 cover fits a Dana 70. The earlier 11.5AAM is almost as big, so why not keep common parts?

Don and I had a chat about these the other day and he encouraged me to add some details to the confusion ;-)
from 2019+ here are the new options:

11.5" AAM 2500/3500   12 Bolt R/G
(DRQ/ DRX Axle Code) 32 spline pinion
14 bolt Cover;  30 Spline Axles

12" Ram 3500  16 Bolt R/G
DRC / DR7 AXLE CODE 32 spline pinion
30 Spline Axle / Carrier Case
14 bolt Cover
(Don's truck)

12" Dropout  Ram 4500/5500   16 Bolt R/G
"DRY" AXLE CODE  32 spline pinion
33 Spline Axle / Carrier Case

the AAM rear has a carrier break for the 1st time since it's inception in 2003; 4.10/down 4.44/up, and most have a new "trac-rite" clutch type limited slip like Don's here. We do have new gears for them, up to 4.44 ratio front and rear, and factory limited slips, but the supply is low from AAM, i'd say we do 2-3 regears a month, whereas on jeeps for example it's 20-30 a day for comparison.

since our setup specs have not been updated for a while, here are the details on these new differentials as well:

Set up specs : w/ OE gears

11.5:
Back lash – 0.007-11
Pinion Bearing Preload  - 15-25 in/lb
Carrier Caps  - 207 Ft/lb
Ring Gear Bolts  - 59Ft/lb + 64 degrees – OEM bolts are Torque To Yield – DO NOT RE USE  - OEM bolt # 5086783AB


12”:
Back lash – 0.008-12
Pinion Bearing Preload  - 23-37 in/lb
Carrier Caps  - 180 Ft/lb
Ring Gear Bolts  - 74Ft/lb + 57 degrees – OEM bolts are Torque To Yield – DO NOT RE USE  - OEM bolt # 68455381AB

‭Amos 5:24 ESV‬
[24] But let justice roll down like waters, and righteousness like an ever-flowing stream.