Mark T

Judging by that tag on the rear ? It's not a Mack reman , early failure of those isn't uncommon. Those plugs you mentioned up on the power divider and side cover for the bevel gear will need to be filled when you replace the carrier. The power divider.... you'll put a couple squirts in and it'll be running out, but it has to be filled in there. Then the other plug on the side cover and the bottom plug on the housing, all need to be filled. Then if nothing leaks ?? a check in the plug in the housing will be it .

Leaf springs are supposed to be able to slide over each other as they flex. Those springs and bushings are just worn out. Sounds like you don't have big enough tools to make that repair. R.E.D. is right

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You can actually see the bushing out of center in that one picture and the leafs are worn into one another. Time for some new springs and you'll need someone to either find you the heaviest to fit the chassis or add to it like someone already did. They're only rubber bushings and not very good at taking the pounding greaseable pins and bushings will .

That's a twelve thousand pound axle and suspension someone seems to have added a extra leaf to. It'll sit up a little better, but everything was engineered for 12000 pounds. So it's bushings probably are shot from being overloaded.

What he has is called a cobbled little taper leaf some brain surgeon thinks is better that way to put more weight on on his basic 12000 pound steer axle. Guys do it, it kinda works (I guess) Think on that model truck ? I'd take a look at the cab mounts , that'd explain a clunky noise by his feet.

That looks like an aluminum frame in that truck. Be interesting to see some more of that Mack

Who's that guy standing by the B53 ? Something almost looks familiar about that guy 🤔

On a truck that old ??? Who knows what someone did or didn't do to it over the years. The important thing is you have the stainless steel /teflon discharge line . It really doesn't matter how long it is after a certain length. If you do decide to anchor it to something away from the exhaust (good idea) You'll need those P clamps with the teflon instead of rubber or they'll just melt and wear through your new discharge line. Believe it or not, that discharge line gets pretty hot from the compressed air going through it. Just run it with gradual bends if there's extra discharge line. (like winding it up in a loop is a sure way for it to collect water and freeze)

It'd be braided stainless or copper from the compressor. Then most mack's of that era had a fitting with pipe thread on each end and a mounting hole to anchor it to the transmission. The ss or copper on one side, and usually braided rubber airline with JIC fittings on the other to the wet tank or dryer

IDK how long they're required to be, but they're like that on account of the heat. Even the P clamps are lined in Teflon ( usually white on a Mack ) lots of them switch to something else with a fitting that is bolted to the transmission.

Some older Diamond Ts used that cab, I think Hendrickson and maybe even a couple others. How about that repair on the cab corner ??? Pretty nice work (along with the rest too)

Sounds like what would be called a blown head gasket from combustion passing by it .

Why is the head off it and what damaged the liner ? Not much of a chance of it ever sealing as it should with the liner damaged, no matter what fire ring or gasket.....and why is the liner damaged ?????

Those trucks have IH Comfo Vision cabs (or some name like that) Used by Diamond T, but not REO

I could be wrong on this, but I think some of the old Thermodynes had hollow crank throws. (along with no oilers) As the Maxidyne evolved and horsepower went up there was some kind of update that added bracing from main cap to main cap. So much got better and better over time. Another thing that was huge in accomplishing all this was higher injection pressure (made by a pump that could have a life)

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(lol) I have a '21 Peterbilt with the same set up, except I use a 10 speed

I had 2 MP7s one was a Maxidyne and one Econodyne. Far as I know it was only a software difference One was a 395 and the other a 405. Those little engines were sorta like you suggested about the V8 using everything for power. In my opinion ???? cubic inch for cubic inch ...not many run like them. (and yes I know they don't leave a trail of fire, but they're a tiny engine compared to even a 13 liter) and they're actually fairly close to the same displacement as a 237

Live tandem twin screw. Little 34000 pound Eatons with the round housing I believe

Multi speed transmissions gained popularity as axle ratios became faster. A truck with a 3.7 axle grossing 80K would have a hard time starting out on black top even with a 6 to 1 first gear in the transmission. Newer engines all made much more torque than engines common in the mid '60s

Back to original question. Maxidynes didn't get their grunt from some mystery valves . 50 years ago, they engineered away lots of shifting, and now they do that with the M drive .

Fuller jumped in on the concept. A PowerTorque Cummins worked with a five speed Fuller. Husky Drives and TO 95ALLs were made just for that. Of course that was years after Mack had a good foothold on the less shifting idea

We all know the guy with the 3 year old truck that looks 30 😂 and they're getting more popular than ever cause that's about when good warranty runs out

I think see'n how as that pickup is all dolled up and ready to go ? Might be a good vehicle to try a low altitude girl in a car picture