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Sorry, I'm popular. :) not. I have a starter to ship out for another member, I'm over-due on. Then will reach out to you. Thanks.

Check fuel tank dip tube and its solder joint on the underside. Replace the fuel lines, especially the suction side. Make sure the frame mounted fuel filter (if you have one) is sealed up tight and the square washer is fully seated squarely into the housing, rubber side down, drain valve is...

Pinch the return line closed with Vice-Grip needle nose pliers, and try again. Report back. Don't run it long if this works. It is just a diagnostic indicator only to check/test/field clean the overflow valve at the return line outlet banjo fitting. Sour fuel could have sludged it in the...

I've been on here so long, I'm now starting to forget things. But, if I remember right, after an LED upgrade if you simply remove the indicator bulb on the signal lever, I believe it works and flashes correctly. I think you just need to change that bulb as well to LED and then it all works...

*presses "Jealous" button*

Sounds like an entire bed change if going front trunnion hoist? Special request for rear bed to frame hinge pics, and if they put anything atop of your truck frame, like spacer wood or another box frame. Speak up how the PTO clears the frame rail and exhaust pipe too. Please and thanks.

The stock military alternators use a remote sense wire as the primary method of setting regulation (system) voltage. If this circuit is broken (internally, or externally [wrong shut down switch order]), there is no fail-safe. It then assumes system voltage is zero, so it drives the alternator...

There

Trans oil temp should be approx. same as engine coolant temp, unless you are working the trans pretty hard. Or unless your gauge or sender is wrong.

Free Cummins p/n's, diagrams, service manuals, etc..... Register (free), enter ESN (Engine Serial Number), and you have access to a plethora of info, all from the people that made it: https://quickserve.cummins.com/info/index.html

Understood. A winch probably adds more value to your truck than lockers, on a cost basis. If it is mostly just for attending a rally, then there will be a lot of other trucks there cheering you on to get stuck, get out, and would help pull your truck out if need be.

I don't have any experience to answer your good questions, but I imagine they must be fairly tolerable, since they were supposedly standard equipment in Marine issued M939's? I do have 2 used Detroit Locker 5t diffs that I would consider selling. The air locking fire truck axles are cool...

Nice work, clean install. Thanks for posting details and answering questions.

You don't know who is here, if they own ex-military vehicles or not, or what they use their vehicles for. You are free to judge, but your opinion doesn't matter, nobody's does really. You get to do what you want with your truck as does everybody else, if or when you have one. Arrogance is...

Agree with above, and I don't even have one installed. I have part of one, and have only seen others for sale in parts as well. This tells me that none of them work.

Start by lubricating this modulator cable first. I used WD-40 and the straw directly down into the cable housing at the top by the throttle connection. You can freely pull on the cable and release it while doing this, to work it in. Makes a huge difference. You want to make sure it is moving...

I only know it because I went through it myself. Could be a few options on PTO/gear. A different compatible PTO with shaft output should work same? Or, convert to hydro winch drive and use a belt/clutch pump, the 939 hydraulic tanks are very narrow.

If I read it right and your are needing the frame to be rigid, you’ll be extremely disappointed. Majority of M939 frames are mild steel at best, deliberately, with minimal cross bracing, specifically designed to twist and keep the maximum number of wheels in contact with the ground. This is why...

That’s exactly how it goes for many that do that mod. A lot fight taking the plug out. No room, breaks, strips, etc... It is supposed to have a decent effect though. I want to see that truck pull a block wall over soon.

Clamp the return line shut out of the injection pump. Replacement overflow valve may be held open by yuck. Don’t hold it too long like this, but good to test.