Somehow it took almost 10 hours to bolt everything back in. Struggled with a bunch of random stuff, but eventually prevailed! Truck is on the ground, running... BUT...

I now have the "trifecta" after the truck sat dead for a while. Anyone know a sure way to try to clear it? Tried unplugging the batt for 10 mins, no luck.

I don't see how anything could have changed. Hopefully the truck is just spooked. My front right brake is applied for some reason. Only the front right. That would make me think.. Speed or ABS sensor? Was also told... Steering wheel sensor?

I guess I will have to drive the beater one more day. Sigh.

What do you mean by trifecta? Do you have access to dis or inpa?

ABS, brake, and stability control lights.

I don't know what those are so I guess not.

Dis or inpa is BMW software to diagnose problems. I suggest you take a short drive. Car may have just freaked out from being in air so long.

Thanks Slick. You've been a big help throughout this thread. Props...

Going to get the garage cleaned and take it around the block. Fingers crossed.

About 2 minutes into my drive... All lights off!!!

Noticeable increase in driveline response, and noise from driveline reduced in some situations. Car no longer "clinks" when engaging R or D with brakes on.

The shifts are better as well. Most likely the TC chain slack.

To be fair I haven't put in truck through its paces yet. Something I have been reluctant to do since I started diagnosing these issues for fear of TC failure and standing my GF.

Yes I let the GF drive the X only after she got proper instructing on the vehicle.

BIG thanks to X Outpost.

Here are the parts I ended up needing...
Front shaft rebuilt with longer splines (Cobra
Rear shaft rebuilt locally (Midwest Transmission)
TC chain, input shaft, seals and bearings. (Cobra)

From BMW/Tischer/ECS/etc
F/R guibos with all associated nuts, washer and bolts.
Grease for shafts (black lithium)
White lithium grease for shaft ends
1 qt TC fluid (super easy to fill while TC is on the ground)
Protection cap (fucked up my previous one on removal)

4 huge jack stands
Multiple jacks
Tq wrench
A good friend to lend a set of hands. Or in my case, I handed him beer and he did the grunt work. Sometimes we worked together on things.

Can't wait to go get some miles on it.

Give it a hundred miles, and slowly start enjoying it. You deserve it after all this.

Thanks, poor truck was down almost 5 weeks. If you really planned it right, I think it could be a weekend or 2. Just too many other things going on that required time and attention.

Just took it for a longer drive. Truck is an absolute monster in the snow. Driveline feels new. Truck is completely dialed in. Now to just keep it out of the salt.

What do you guys think of putting two front guibos in to extend the drive back into the transfer case.

Did you end up trying this? I was thinking the same thing.