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The one bug the multifuel trucks have is a tendency to throw rods. No rhyme or reason why.

If you are 100% certain you have good bubble free clean plentiful fuel flow to the ip and unrestricted return lines, and If you are 100% certain you have uninterrupted 24 volts to the ip, And your ip is over 10 years old, it's time for an overhaul.

Sure. You said: " I already checked gas tank, fuel lines from tank to pump to filter (put in a new filter) and return lines. All are good with clean gas. " Knowing this, the symptoms you describe (stalling, no power, sometimes idles bad) are those of a failing injection pump.

The heads are interchangeable. If you buy a used one, have it checked for flatness.

Your injection pump is shot.

The injection pump solenoid has to get 24 volts for the engine to stay running. The circuit powering this solenoid is completely unrelated to any circuits related to the 4L80E.

For sure 1964. For sure M543A2. Maybe USA number of 5D6804 (interpolated) Data snip from Carnac's Historical Thread. EDIT: I didn't look closely enough at the database earlier.

Oh I like that machine you have there, like a Swiss Army knife. We don’t have anything like that in the US.

I solder pigtails onto the prongs and then insulate with a blob of silicone. Also, there is no way to incorrectly wire up a 24 volt seal beam to make it burn out.

Oh that is nice. GEP too. Example of the yummy surplus that local government gets to pick from. We get the left over garbage.

Hmm my HMMWV has that pump and it makes no noise. Lots of times these HMMWV engines were pulled from trucks in a very careless manner. Pump may have ingested big dirt.

Is the pump shot? Cummins swap won't fix that.

If the hood is straight and rust free, might as well use it, no difference from civilian other than color. Well that one has the hood ornament and associated hole. I would find a “6.2 LITRE” ornament and paint the chrome part green, would be unique.

Looks good! I like the hood ornament, does it say 6.2 LITRE on it?

Sure good idea. Will last longer not out in the weather

For sure it’s a 1971 year model. The title should have the frame number, which starts with 0525. Edit: made a mistake

There are many many places to have your injection pump rebuilt, the place I use is Home (dieselpumphouston.com) You send it there and they send it back ready to go. The fuel pump (lift pump) can come from anywhere.

Clamp underneath was for armor that was removed and cut up. Picture ending in 32 is where the CDR valve goes that was removed by GP. Buy a new one from Kascar etc. Picture ending in 06, and 32, yes lots of fuel hoses removed by USMC. GP typically does not do this. Means the fuel system was...

Gym membership?

Tank and bed are one huge weldment. Were there no cargo trucks available to buy?