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See this scenario is why I was halfway serious about my "animal" remark, the electronic trans won't downshift if the injection pump went to WOT on it's own internally.

The heads on the pickup version of the 6.5 are different than the van/bus/H1/HMMWV version, the intake ports are at a different angle. You can use the pickup SHORT block but that is getting you into a lot of work.

If you have a way of verifying that the injection pump is doing this on its own, as in the control shaft isn’t rotating, your injection pump is crapping out internally. Time for rebuilding.

Is there an animal curled around the injection pump?

Diesel Pump and Injection on Navigation St.

Ugh the Popular Mechanics pickup modification. I see $2500 there, sorry so low.

I would jump the neutral switch first, next I would check the wiring at the starter, next I would check the cannon connector at the start box under the hood. I think you have corroded connections somewhere, not related to your remote start setup.

You can use the pickup truck longblock but you have to ditch the turbocharger setup and reuse all the 6.2 exhaust and intake manifolds.

Need to know what the 6.5 is out of, pickup or van/bus? The pickup 6.5 has the side mount turbocharger and that won’t fit in a HMMWV. Electronic injection pump has to be replaced with mechanical.

I think you have two different transfers, the one with two control shafts is for a WWII GMC CCKW with banjo axles, the one with one control shaft is for a 1950's GMC "G749" deuce and a half with the single speed transfer. Value is what someone will give you for them. Swap meet price I would...

Several threads here on converting to the Hummer H1 viscous clutch, use search term viscous. I changed over eons ago and never looked back.

Spinning the bronze winch bull gear at high speeds for long periods sounds like a recipe for creating bronze shavings.

All M38s and M38A1 were 5.38-1 axle ratio regardless of build year. The T90 transmission ratios didn’t change either.

Uncle came out with a drop center 16” rim in the 1980’s but they are super scarce. Suggest you swap axle.

Also consider what a pain it is to manually load and unload a truck with the bed height of dock height of 52”.

I think it’s ok. You see towbars set up like that all the time in wartime photos. Your 08 is looking real good btw, I really like that you have the cargo enclosure set up. That is a ton of scrounging and work.

Here is a list of US Army (not USMC) mules that remained in service in the 1980's. As you can see, backing into a year of MFG is dependent on getting the registration number from the platform by carefully sanding with a DA sander. List courtesy of member Carnac.

Unfortunate situation. On the side of the platform, is there any possibility that the registration number has been painted over, along with the service branch? You might have to do extremely careful sanding to find this. Typically people do not sandblast these like what happens with steel...

The handle rod had a J hook made in the end of it. I think that jack was Gama Goat truss kit issue.

That depends entirely on the terrain you plan to conquer. If your truck is a pavement queen then no. Hells Revenge at Moab? Better go the entire 10".