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.