So I did a full rebuild of my AX15 and swapped to an external clutch, and a full rebuild on my T-Case and added a SYE. 8* shims to get the pinion all lined up...

Runs like butter!
Super smooth shifting!
Rides like floating on air!
Idles at 500/600 ~ before was more like 750-1000.

There's 2 things I've noticed...
1. Speedometer no longer works. I don't know if it's a wiring issue or the different diameter of the RC output shaft

BUT MORE THAN THAT

2. Though it idles awesome (in neutral w/ parking brake on), it "goes to sleep" when I quickly come to a stop.
* Happens when I shift to neutral or use the clutch.
When the RPMs drop from 2000'ish to idle, they don't stop till she's asleep.
And she's running so smooth, I didn't even notice the first time or 2 until after a moment or 2.

Since it shifts super smooth now = I know the clutch assembly is working
Since it idles perfectly fine in neutral with the parking brake on = I don't think it's the idler shaft baring.

Everything ran the way it should before I did the work (minus the clutch slave or hydraulic line issues) so................

Any thoughts on what to look at/for?