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No frame numbers. The engine serial number (located on boss near water pump, starting with MD) is unrelated to the vehicle serial number. Not entirely sure how to verify what lockers you have other than opening the cover and looking.

I forgot, are those DDEC or manual fuel, I think manual, the HETs are DDEC, anyway, problem might be the fuel rack is stuck in the off position, remove a valve cover and check that the fuel rod is moving a gear at each injector when you press the gas pedal.

My 2 cents: lots of GM 6.5s run 100’s of thousands of miles in pickups etc. But they are 2000 or older. The GEPs are 2001 and newer and have beefier castings. That alone is peace of mind. I doubt you will find a GEP in a HMMWV with over 60,000 miles.

Examine the slipper ends where the springs are captured by the axles, and you will see that there is about 1/2" of side to side play. This clearance is what you are seeing.

Welcome. Is your power converter working? It has fuses that can be blown and cause no charging of the second battery.

You have a very special M38A1. As you have surmised, it is a USMC Jeep with the high frequency long range radio set. It would have had the 100 amp generator (4 groove pulley) system as well. It could very well be one of the late production (1964) with positrack front axle. To determine the...

Your HMMWV is the 123rd vehicle of Air Force class K accepted in the year 1995.

That is a perfectly good filter for your engine.

Me thinks that is a field mod used to pressurize the fuel tank to get fuel flowing fast to the IP etc.

Are you saying no more will be sold from the bunch that was transported from CO to PA?

Ah you have some learning to do grasshopper. The CUCVIIs have (had in your case) 24 volt starters, and a solid state 12/24 volt converter to charge battery #2. Tons of info on these here on SS thanks to member stonepicker.

EUC? when did that start for FMTVs? Couple of data points, your truck likely went through a rebuild given the upgraded marker lights and front panel. The miles shown are since a new speedo was installed, not actual.

Welcome! That is one nice M38A1! Someone did a lot of restoration on it. You want 10W30 petroleum oil in your engine. The canvas top does have rods that go from the front bow to the windshield, but they have a 90 degree turn at both ends.

On the hardly readable data plate.

Transmission is not in any way connected to air system. If you are applying brake to shift to reverse, maybe this is what is making you believe the issue is transmission related?

That is worth saving. It's referred to as a 1 ton trailer, it's WWII, usually made by Ben Hur.

Axle pinion is parallel to frame. So there is the allowed 2 degrees.

Any chunks of plastic floating around in the cooling system will for sure end up plugging the radiator tubes, leading to overheating. Flush everything and get the radiator rodded out.

How did you find that the factory drive shafts are unbalanced? They were removed in the field by Stewart and Stevenson employees and destroyed. The new driveshafts and bellhousing is better able to withstand the vibrations generated by the driveline angles. In almost no cases do these trucks...

The front brakes are not part of the parking brakes. Does the front brake release with zero air pressure in the system? That would mean air system issues. If brake still engaged with or without air, you have a stuck plunger mechanism on the brake air canister.