67RModel

Sold for $10,000. $11,000 with the buyers premium.

We have been getting a ton of rain through here lately. The only thing I can figure is they pulled it out of the barn for the auction and they put it on there to keep water from getting in a rusty or bad spot on the cab.

Looks to be a really complete and original 1950 Mack LJ Tractor. Selling at auction via Proxibid.com. No affiliation. Just passing along. If someone wanted a nice complete LJ to restore this one would certainly be a good candidate. Looks Like Cummins powered. Located in Mogadore, Ohio. 1950 Mack LJ Semi Truck | Collector Cars Classic & Vintage Cars Classic & Vintage Cars - 1950's | Online Auctions | Proxibid

Can't say that I have ever seen a 700 series U model. Would be nice if there was some more pictures and specs. Probably a pretty scarce truck. Not mine. Just reposting and passing along a Marketplace listing I thought was interesting. It looks slightly different than the 600 series U models I have seen. The front fenders and grille look to be about 4"-6" taller. 1974 mack u700 - Commercial Vehicles - Berwick, Pennsylvania | Facebook Marketplace | Facebook

I don't have any facts to verify but what I've gathered over the years is up to the point when econodyne was "introduced" Mack engines were 2100 rpm high torque rise engines that used 5 and 6 speed transmissions. Rated HP was at 2100 rpm. The econodyne engines turn slower and have their rated HP at 1800 or 1750 RPMs to save fuel and less engine noise / driver fatigue. My guess is the there are slight differences in the fuel system and engine internals (cam / pistons) between a 2100 RPM Maxidyne and an 1800 RPM Econodyne. Again no facts. Just anecdotal info...

@reb87 I was just browsing Bring A Trailer's sold listings and noticed this truck sold on there for $11,000 back on 12/9/2023. Not sure if you knew that but here is the listing and bid history. I think you are able to contact and send PM's to people through that site so maybe you could contact the seller and maybe get more information on its history. I wonder what happened to the buyer. He had it about a year and took a total bath on the money. After consignment fees to Ritchie Bros he probably got back less than 20% of what he paid for it. No Reserve: 1953 Mack L-Series Wrecker for sale on BaT Auctions - sold for $11,050 on December 19, 2023 (Lot #131,220) | Bring a Trailer

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For $3500 that is worth it even if the engine block is windowed. You can pick up a good running for another $3-4k if you had to. Or you could sell the dump box and hydraulics for $3500 or $4000. Buy a running 4V E6 or fully mechanical E7 for what you sold the bed for. Not to mention its from Washington so you know its rust free. Anyway might just be a broken valve spring or something stupid like that.

Saw this story messing around on Youtube. I thought it was a pretty neat story. I like how his truck isn't at all shiny and clean, doesn't look fancy, but its impeccably maintained. And he has driven it every day since 1995 and over 4 million miles. Pretty impressive.

Call local Mack dealer and give them your VIN. They should still have info for a 1978. Or call Watts Mack, the owner of this website. They have all the dirt on the old stuff. There is a Mack dealer parts guy on here a lot that always seems to come up with something. @The Heinz

The only way that truck could be better is if it had the New Process NV833 4spd OD transmission in it. Behind that 305 and with 3:55 or 3:73 rear would be a holy grail ride for some square body enthusiast. Manual transmissions in that era of GM pickups almost seem rare. Fords seem like they are a dime a dozen.

If I remember correctly they have a real nice distinct sound to them too. Maybe it was the muffler that was on the truck. But it sounded real nice and kinda mean. Like I said I never drove it but rode in it many times. From the passenger seat it seemed like it revved like a gasser. Almost like it had no flywheel on it. But you could also lug it down pretty hard and it would pull the weight.

Probably a front spring upgrade too. I would think they are pretty heavy compared to a 350 or 454 gasser.

I posted this a while back in another thread: Years ago at one of my first laboring jobs as a teenager we had one in a 1988 GMC Top Kick dump truck. 33,000 GVW with a 2 speed rear end. I couldn't drive it because it was a CDL truck but everyone who did abused the ever loving snot out of that truck/engine. Always overloaded. Under maintained and just down right abused. Some of the guys did it intentionally because the rest of the truck was just utter GM junk and they didn't like driving it. That thing never missed a beat. That engine would start and run no matter what. The company ended up selling it years later to a farmer who just wanted it for his property. The frame got bad rust jacking and nobody would pass the state inspection on it but it ran like a sewing machine when the guy took it away. That's my only experience with a 3208 but have always heard they were underpowered for their size (10.0L) and not "good" engines. My guess is if used and maintained properly they are probably as good as any other engine....

The 3208 Cat was available in the 400 series R models. It was an R482. and an R483 was a 6V-53 Detroit. I saw another 3208 Cat powered R model at Macungie last year and have seen a few here and there over the years for sale. My guess is the majority of customers who bought them new back in the day were municipal users.

The US has run a trade surplus with the UK for years and last year was nearly $12billion. Why were tariffs imposed on the UK to begin with? When was the last time you bought anything made in the UK? Ever? They send nothing here and buy copious amounts of energy and tech from the US. Heck their nuclear navy is 100% reliant on the US defense department and contractors for repair, overhaul, and refueling of their entire fleet. My guess is a 4th grader could have made this "deal". What could it possibly say?

Does anybody know what these kind of mufflers are called? Or what brand? Are they still available anywhere? Did they offer some kind of advantage over a "regular" muffler?

I have seen high rise rest rites but never one with the windows up top like that. That roof section looks like it was taken off some other brand of bunk, however, Rest Rite would build you whatever you wanted. That one was made somewhere in the mid 80s to early 90s after Rest Rite had moved do a much bigger location in Delmont, PA. When the company started out they were made in a little garage on Sardis Rd in Murrysville, PA. The Diamond Reo at the Iowa 80 museum has a high rise Rest Rite on it but with a flat top.

It was definitely a Diamond Reo. The majority of the Diamond Reos I have seen don't have the large lettering going down the side of the hood. It had this emblem on the front and sides of the hood. Yea I don't know about tracking him down. He had to have been a farmer or something going to pick up something local. I can't imagine running a gasser like that for profit. Although on the other hand buying copious amounts of gasoline and getting gallons per mile is probably still way cheaper than a $6500/month truck payment and buying diesel fuel too. I will note that it was a tandem axle so he probably wasn't "dump trucking" for hire. It would need to be a triaxle to be able to get any work in this area. Also it had regular PA truck plates on it so he wasn't crossing state lines...

This was the most recent mention of Diamond Reos that I could remember here on the forum so I thought I would post this here. Yesterday this guy was behind me. I saw him coming and he passed by me when I was waiting to pull out going the same direction he was. I eventually caught up to him and got in front of him. I still cant believe he is running this thing in 2025. It was a dump truck and in pretty decent shape. I'm thinking it is a early to mid 70's Apollo 101 model of some sort. At several red lights I was able to see it had a valid inspection sticker on the windshield. It was a gasser of some sort and probably some kind of road ranger transmission. When we would come to a stop at red lights I could hear him shift the transmission range down to low. I believe he was empty at the time but the thing scooted along pretty well for being an old gasser. just thought is was neat to see one of these still working in 2025. It actually boggles my mind lol.

Not necessary related to this thread but more or less just a curiosity of mine is how parts become obsoleted. Like who sits around and studies parts breakdowns and says we are no longer going to have xyz part available anymore. How can one part of the same assembly be easier to get than a loaf of bread but the one it attaches to has been NLA for a decade or more?

Could somebody post a picture of what the whole system plumbing is supposed to look like? A photo from an original tip turbine equipped truck?

SOLD about a year ago now

If I'm not mistaken there was like a year or two in the early 80s, maybe 1980/81 when Mack painted the engines red. And I don't think it was exclusive to fire trucks. I have seen several over the years that have a dull red engine paint.

No affiliation. Saw on FB Marketplace but thought it was a pretty interesting truck so I figured I would post it here and see what everyone thinks. Obviously its a ton of money. I'm not sure who the market would be for a truck like this. Collectors or Guys looking for a reliable old school workhorse. I would think a super heavy spec day cab that is 5-10 years old would be around the same money. Question I have is do you think there are guys that are willing to spend $75k on something like this and use it daily? 1984 RD686 Mack tractor with 25k org miles.300 6 sp 58,000 rears 11x22 tires wet system fenders 18 F - Commercial Vehicles - Boston, Massachusetts | Facebook Marketplace | Facebook