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The things you find on YouTube. .....Hippy

Do you have much mechanical knowledge/support? You're missing a fair bit of peripheral parts on that engine. If it's a free truck that you have to invest a bit to get running I say go for it, but double check first that you can get a title for it and get it registered and legal for the road. Would be a pain to get the truck running then not be able register it because of paperwork issues.

How many miles are on the truck? This truck should have an AI-350 motor I expect. Don't pick up an AC motor for it, it's a different bag of garbage emissions stuff. The AI motor you can delete the emissions stuff and create a much better breathing engine. Just look up "loggin dog dead dog remediation" on this forum.

Now that you mention it, yeah I was half-wrong. We see the faulty diff lock switch on Meritors constantly. Customer lost a few diffs to it too, course that could have been driver error masked for warranty's sake, but I digress. We have seen a couple of diff lock switches faulting on Mack rears, but nowhere near as often (or as violent) as the Meritors. Could be that or wiring issue somewhere, unfortunately all I can do is help you guess!

You really need to ascertain if the diff lock's are on or just the light. Side to side locks will be evident if you try to make a sharp turn, PDL (interaxle) will not be quite as evident. None the less I think it is highly unlikely the locks are on and you don't know it. Much more likely a switch or wire is the problem. You can take the air lines off the actuators and throw the switch one way and then the other, you should get air in one position and not in the other. Truck may need to be in "running down the road" (brakes released) condition for this test, so wheels blocked so it can't move. In the years I worked on stuff they could be air apply or air to release (reverse air) but I think everything today is air apply. (IHC and some Dana axles could have reverse air) I don't know about Mack axles. You will likely need wiring diagrams to track down how the light is lit and which wires to look at. Running around in the locked position will cause excessive tire wear and long term will damage the diff's so get to the bottom of it.

Look for cracks around the top of the truck frame at the very front of the dump body. I've seen otherwise perfect used trucks that had cracked frames there. As the frame flexes going down the road the front of the dump box creates a pressure point on the frame.

I enjoy tinkering with my Cub cadets. Early 70s models. I want to build a loader for the 127 someday.

They’re Mack axles it’s strange that it says they’re engaged I’m an owner operator no one drives this truck but me and I don’t ever use them.

Allison Autos are usually paired with 350-375 hp motors, much more than that and you'll burn out the clutch packs during shifts. Your rear axle ratio is going to be important for quarry work, in PA quarry roads are STEEP! Not sure where you are. Truck has camelback suspension which is ideal for quarry work in my opinion, assuming it's rated for the loads you'll put on it.

If they are Meritor diffs the switch may be faulty on the diff! The axles may not be locked but the switch is saying they are!

Paul, You guys sure have some large hood ornaments over there! lol .....Hippy

My god that’s just insane… but that’s the way they design them these days. Nothing seems to wear out inside main driveline . Anymore …..just All add on China accessories that shut everything down …get rid of all that ,,,,,and we would be saving everyone’s time and money… lol bob

You could contact DEX Heavy Duty Parts, they tend to have used engines for sale, just don't accidentally buy a core engine unless you want to overhaul it! A shame someone stole the valve covers and head, or else you could piece the engine back together and go from there. Sorry people these days have no shame in putting others in a bind. It isn't my money being spent, but it would be great to see your dad's old truck making you money. If you go the engine swap route, I'd try to find an E7 ETECH, pre ASET, which should fit right in (Experts, please refute my claim if need be!). Though like Bob said, the truck was parked for a reason, and an Allison transmission could be why. They can be a bit expensive to fix, but they certainly are fixable. If you wind up needing any parts and happen to not be too far from me in NC, I'd be happy to help locate smaller engine parts like the turbo, EUP's, etc. I just won't be the best help with used engines, I don't have many resources for that.

OK, that’s just weird… bob

The actual diff lock switch can be bad too, we've seen this a couple of times. At least the company's drivers said they didn't leave the diff lock on during interstate driving.

Yes

Do they look like a bunch of little black cubes?

Do you have a row of celenoid s on the frame rail behind the cab? They are small. And they are piggy backed. They control suspension, fifth wheel, power divider, or whatever else. That i where the air is delivered to the component.

What's the current state of affairs with the new ride Any luck yet ?? Paul

so true Bob. the general consensus was it went over to the sandbox as that was rite around the time everything was getting developed over there and they were buying everything they could for top dollar even if they were just parts trucks.

$225 per hour here in jersey. and if the computer can not tell them what is wrong, they can not fix it.

Hi guys I have 2016 mack pinnacle with Mack axles. This morning while doing my circle check I notice my axle lock is stuck on theirs a light on the that says fr axle lock when I hit the axle lock switch nothing happens, when I start driving a message comes up on the display saying inter axle. All the wiring is attached to both axle housings I don’t see anything broken or rotted off what should I be looking for? How do the axle locks and inter axle work on Mack axles.

That’s kind of a weird end

Less than 19 weeks, Bubba can’t get out of this fast enough…. Bob