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Someone jerry rigged that lever. Suggest you go back to stock setup.

You must follow the TM instructions to a T. Jack up front end and turn wheel lock to lock 500 times or something like that to bleed air.

The box is throughly grafted onto the cab, the cab roof and entire back wall is cut away. You would need a new cab to make a pickup.

Pull choke if cold, turn on ignition, mash the starter on the floor, release when engine starts. All 40’s and 50’s cars and trucks had the floor starter button.

Welcome. Yes you are in the right place for help with your 880. On the website header, find "TM", then navigate to "M880 TMs", then find TM9-2320-66-20, the wiring diagram is figure 2-12. If you have the blackout kit added, that is figure 3-17. Good luck!

I forgot, does that truck have a neutral safety switch that could be stuck?

Dirty front wheels can be attributed to leaky knuckles or leaky wheel cylinders. I have found that brake fluid somehow magically disappears even with no visible leaks. In your case I would check level frequently.

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?

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.

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