First off, no vibrations.  Looks like all our scientificallities paid off.

We found when testing the Atlas, it was still hard to shift so we took AA's advice and turned back a couple of brass bolts located on the Atlas.  This enabled it to shift a little easier.  You are supposed to retighten them after operating it a few times.

Even though we had put the old speedometer set up back in, it and the odometer still weren't reading on the dash.  Since we were headed out on a trip (what mileage discrepancies?) we didn't fix it just yet.  Later I pulled the gear, checked it, and then replaced it, but it still didn't read the speed.  So, doing what any "smart" problem solving mechanic would do, we put the Jeep up on jack stands and let Chris drive it in the driveway while I lay underneath it.  I figured the teeth on the gears just weren't lining up, so, avoiding the spinning driveshaft, I played around with it for a while until Chris let me know it was registering.

We also found that we needed to trim a bit more off the console at the back of the slot where the sticks were hitting.

Performance

You can definitely feel the added power underneath.  Just putting it in gear, the Jeep sits further up on its haunches.  Putting it into low gear, it almost feels like you have an air bag suspension and the auto tranny shifts out of 1st like it's not even there.

It is, as was expected, harder to brake when in 4L.  Upgrading the rear brakes when it's time to do the axles ought to fix that.

The Twin stick set up is pretty cool.  It allows multiple combinations of drive choices, even Front Low.

We had heard that Atlases when stuck behind auto trannies seemed to bind up more and we have witnessed it on occasion, but when all is well, all it takes is a light push of the left stick back to engage 4H.

The one thing that is left to be desired is that Low ranges can only be achieved if the vehicle is in N and slowly in motion.

The main thing above all else is that Chris's Jeep will stop eating transfer cases.  Atlas's design for strength almost guarantees indestructibility.