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Your M923 is part of the M939 series so start looking here: https://www.steelsoldiers.com/threads/m939-series-tms.218395/ The M920 is part of the M916 series of trucks (completely different) The NHC-250 is 855 cid (14 liter) and is a pretty good engine.

Does the engine bar over by hand? And the battery is connected for 24 volts?

If you haven't done it yet, it may be time to do the dual fuel mod with new fuel line routing.

Gonna do an autopsy and report back?

Just in case...Army Surplus Warehouse up in Idaho Falls has chains for 16.00R20s

I'm running 60 in front, 35 in rear and 40 in the middle for now, but I still experiment with different rear settings. Truck is empty. I like the chalk/paint idea - will have to try that out.

What pressures are you running front & rear?

I finally applied the unit numbers to the rear bumperettes:

It's very strange how they can fall out so easily and then not want to go back in without some heavy persuasion

Mine was never apart in 2 pieces but I had to fight those balls the entire time putting the shaft back in. Two would fall out but never three. I had to flex the joint just right to get the balls back in and pinching my brother's fingers in the process was a risk I was willing take...😆...

It feels good watching other people tackle hard projects and make progress all from the safety of my phone...hehehe. Keep it up!

Is there any shimming to do after the swap or is it just a carrier change over?

Now that's an ambitious task...good luck!

Took long enough, but whoever reads through this thread will want to hear the jakes making music:

This is a new video to show some turbo sounds and some jake brake action. Wasn't building much boost or temps - just getting some fuel and cruising around. Since the last video I've switched from 11.00s to 16.00s so my shift points and rpms are different.

Nice picture

For reference, this is what the guts looked like on my M813 manual shutoff:

I like it! I drove mine to work yesterday and it just ran super smooth; no vibrations, rattles or tire hopping and felt like really strong power. Not sure if it was the temps or what but everything was working superb!

What a cool project!

Eastern Surplus and TNJ Murray have a good selection of data plates so check them out also