JoeH

It certainly won't hurt; describe what's "rough" about how the granite rides. Knowing how it feels tells us a lot. I had the dad of a guy I drove for take the front axle shock absorbers off my truck one night without telling me. After my back was killing me the next day I went into the office (and he was there eating his lunch) I made it pretty clear to leave the old shocks on until he has new ones to put on instead. IDK wtf he was thinking but I was a little pissed. Without shock absorbers, springs will continue to bounce for a while after one bump.

You should always tackle audible air leaks as soon as you notice them. An air leak can become serious enough that you lose your ability to regenerate air for your brakes. Last thing you need is to kill someone because you couldn't stop your truck. A 73,000 lb triaxle vs a 3500 lb car is no joke.

You should find where the air leak is. My '95 Mack cab airbags hold air for days.

I'm clueless, but someone once told me peterbilt triaxles are typically set up that when you set the parking brake the lift axle comes up? No idea if that's true/common setup or not. No Mack I ever drove did that.

Multiple cylinders = more weight. For dumping/driving on a sideways incline on an air ride truck, I've wondered about having the air bags being able to be dumped on one side or the other to give it a bias towards staying level.

Where will tilt sensors mount? Ever dump a load with worn out hinges and the load is stuck up in one corner while you're on a sideways incline?

Pretty sure it's the turbo you hear whistling, not the tip turbine. Tip turbines don't really spin all that fast I don't think. Not fast enough to make noise at least. Most Mack turbos have a nice whistle to them, let's you know it's alive and well! Don't know if this is a new to you truck or one you've had a while now with a new symptom.

If it's transmission oil it'd probably smell like sulfur/rotten eggs.

Firing orders are generally stamped cast into the block somewhere.

Must have a pretty large air compressor on there to keep up with all those brakes.i wonder how much those loads weigh, and what motors are in them.

Rear main seal would make the inside of the bell housing wet and oily. If that's dry then it shouldn't be the rear main seal. Could be oil pan. How substantial of a leak is it that you can tell it's leaking only when turned off?

Good truck there, Bruce!

It's also very common on dump truck applications for the trolley brake to operate all truck brakes except steering axle. That's how our triaxles are.

Recent problem or did you just aquire it and you're trying to figure out what's going on? How's your tractor protection valve? Do you have your lines hooked up right to the trailer? One is a supply line to the trailer air tanks, the other is a signal line. Sometimes trailers/trucks get the fittings switched up because an idiot worked on it.

Been running our 1979 endt676 on pump diesel since the '80s, now into the ULSD were still running it on pump diesel, we don't add anything, just keeps running strong as ever. Pushing 600k miles, mostly local within a 15 mile radius. Lots of hours per mile, as it's a volumetric concrete mixer. Truck averages about 4mpg by the end of the year. My 1995 E7-350 has about 20,300 hours, same deal, but averages 2.5 mpg or less. (Again, it's a volumetric concrete mixer, so it racks up fuel usage on site) Many trucks on here are hobby trucks and get minimal use, so I'd recommend an algaecide, but that's about it. If you are having problems with your fuel racks sticking then you aren't using your truck enough. Algae grows in modern biodiesel, after about a year of sitting you'll have floaties causing fuel clogs.

My 95 e7-350 (all mechanical) tops out at about 25 psi boost. It has trouble getting out of it's own way, but it gets where it's supposed to go. Will make 1200+ degrees EGT, though I try not to push that number. I just assume it's working as it should....

https://www.eaton.com/content/dam/eaton/products/transmissions/vehicle-transmissions/8ll/eaton-fuller-havey-duty-transmissions-service-manual-trsm1500-en-us.pdf Snoop through the table of contents "in vehicle service procedures". Looks like auxiliary section (page 118) can be removed and services in chassis. Then jump to bench procedure section to see how to do rebuild.

Single frame R's tend to break at the splay under the cab. I have a '79 that the pass side broke 7+ years ago on, we spliced a used frame section in on that side from behind the cab forward. Driver side just broke a few months ago, spliced that rail from behind the cab forward from a U model we had laying around. Truck doesn't have a hard life every day, but we use it just as hard as we need it to. Both rails have 4ft sister frame sleeves at the splices.

The e tech is an e7 I believe. Block and components, displacement, all pretty much the same, just modified right side of the block to accommodate fuel gallery, eup's and additional cam lobes for eup's.

Do you have any air leaks that sound like they're coming from the trans? Could be a fault with your "combination cylinder" sticking or not getting enough air pressure to move it from high to low on the range shift. My truck has 262k miles and 20,300+ hours, and sounds like mine has broken pieces inside, yours could be in similar shape with the synchros.

How about when trying to come out of first for an upshift and the shifter snags halfway out of gear and ruins your shift to 2nd, having to go back to first to get momentum going again?

When I downshift mine from 3rd/7th sometimes it stays in gear, even though I have the shifter in neutral??? Stays in til I punch the clutch so it doesn't explode... PoS... And it'll sneak out of 7th if you're coasting with light throttle. My trucking application would do much better with a Mack 10 speed, multi reverse. Let's go David, chime in on how wrong I am.

It was their truck, they needed it to run a rock crusher, so they did something pretty neat! At least they cut it somewhere that's very easy to splice a new frame section or junkyard cutoff onto.

Looks like tube tires on the front, they'll probably take air, just don't go all the way up to 120.

Many business owners/managers are afraid to fail, so they won't upset the apple cart by changing the business model. Sears did automotive tires, was a department store, used to sell home kits apparently. Lawn mowers, clothes, literally just about anything. They should have revolutionized online shopping, not Amazon. But they didnt want to fail, so they maintained business as usual even though business as usual was changing. They wound up failing because they wouldn't change.