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Old 03-25-2012, 01:55 PM   #1 (permalink)
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Tell Me About a GMC Crackerbox with 671 DD

I'm gonna go look at a 64 GMC Crackerbox day cab with a 671 Detroit Diesel. I think this would make a off the hook tow rig. What do you guys know about 'em and the 671 DD?


Here one pulling a hill wrecking your eardrums with awesome!
Detroit 6-71 in GMC Crackerbox pulling a hill - YouTube
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Old 03-25-2012, 02:12 PM   #2 (permalink)
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We had a lot of 6-71's in some of our older cranes. Mostly before my time but we still have a couple for loading trucks in the yard. All 2 stroke Detroits leak. They rev quick and are kind of fun but, depending on how well insulated that cab is, listening to it would probably get old in a hurry. If it has a turbo it probably runs pretty good. I helped my dad rebuild one in high school and it wasn't bad. The injectors run off of the camshaft and I vaguely remember setting the timing rack as being complicated, but he did that and sent me off on some errand so it may not have been that bad.
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Old 03-25-2012, 02:14 PM   #3 (permalink)
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Also, if you want to get creative, there are a ton of different injector and turbo applications you can mess with to build more power or try to burn less fuel.
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Old 03-25-2012, 03:00 PM   #4 (permalink)
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It WILL be loud as others said. It won't turn 3000 RPM in stock form tho. Be happy with 2400. They won't/don't necessarily leak oil. Just have to keep a good PM for them. Most of them back then had Fuller RT(RTO) 910's. If you do it just right you can get them to turn reverse rotation(BTDT). Smoke/dirt like a bitch out thru the air cleaner. IIRC that is an alum. cab. I never drove many DD 671's, but I've never seen a turbo on one. Did drive the 318's. Maybe just not paying attention. I do know they had turbo's on the DD 350 V8's and V12's.
Picture looks like it has 2 drive axles(no tag). Take out that front drive axle and leave the rear one and as long as wheel base you can have. Short WB COE's are hard ridin trks. My friend has a three axle Pete 379 towing a 3 axle 5th wheel RV and caught a lot of grief keeping it three axle. "The Man" said a 2 axle would alleviate his probs. That truck is probably geared around 65MPH.
And, that truck is too nice of an old Cracker-Box to molest. It's almost pretty.
The first, AFAIK, steering axle air ride system was on a 'Jimmy'. Seen a few back when.
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Old 03-25-2012, 03:04 PM   #5 (permalink)
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mmmmmmmmmmm strech the frame, air bags, weed burners to get the scream out your ears, big cargo box/camper/toter. ya i see lots of possible ways to use it
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Old 03-25-2012, 03:06 PM   #6 (permalink)
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Had that engine an an old bucket truck. Thing was louder than anything I have ever driven before. You heard it coming from a mile away. Had great power through out though. It was prolly the way the truck was geared, but it wouldn't do over 57 mph. We did get that truck to turn over backwards once too. Parked it on an incline and put it in first gear. (parking brake was non functional from a problem earlier that day) Thing started to lurch backwards really slow, by the time I ran to the truck it had just taken off and blew a ton of smoke out the air cleaner on the side of the hood. Stomped on the brakes and it all stopped.
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Old 03-25-2012, 05:20 PM   #7 (permalink)
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looks cool...I sure wouldn't want to drive that. You'd be slap wore out by the time you got to where you were going, noise, rough riding, poor steering.....no thanks....
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Old 03-25-2012, 05:39 PM   #8 (permalink)
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looks cool...I sure wouldn't want to drive that. You'd be slap wore out by the time you got to where you were going, noise, rough riding, poor steering.....no thanks....
Listen Sally, you ride in the minivan and I'll take the semi.

That's not the truck. I'll take pics of the one I'm looking at. Neighbor said motor was gone through a couple years back and it should run. It's been sitting in his scrap yard for about 8 years in one spot. What kind of money are these old trucks worth old or restored?
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Old 03-25-2012, 06:08 PM   #9 (permalink)
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Listen Sally, you ride in the minivan and I'll take the semi.
I don't ride in the minivan I just don't drive some old hoopdie...



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That's not the truck. I'll take pics of the one I'm looking at. Neighbor said motor was gone through a couple years back and it should run. It's been sitting in his scrap yard for about 8 years in one spot. What kind of money are these old trucks worth old or restored?
I'd check around on some other truck sites..I have NO idea where to start on something that old. I'd say not restored, probably a couple of grand a best running. Tires are expensive (24.5s are over 400 bucks each for Michelin or Bridgestone) so just to get it running on the road it could be 3 grand of rubber or more.

Resorted, depends on the right person. I bet you could sell that for 15 to 20 grand cleaned up and looking good to the right person...just 100% guessing on my part for the resorted portion.
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Old 03-25-2012, 06:25 PM   #10 (permalink)
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Kinda reminds me of these trucks......... there used to be an old cattle truck, it was a crackerbox. You could hear that thing coming from miles away pulling the hills on hwy 36.
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Old 03-25-2012, 07:29 PM   #11 (permalink)
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Holee crap! You ain't shittin.
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I don't ride in the minivan I just don't drive some old hoopdie...





I'd check around on some other truck sites..I have NO idea where to start on something that old. I'd say not restored, probably a couple of grand a best running. Tires are expensive (24.5s are over 400 bucks each for Michelin or Bridgestone) so just to get it running on the road it could be 3 grand of rubber or more.

Resorted, depends on the right person. I bet you could sell that for 15 to 20 grand cleaned up and looking good to the right person...just 100% guessing on my part for the resorted portion.

Last edited by jeep937; 03-25-2012 at 07:45 PM.
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Old 03-26-2012, 07:12 AM   #12 (permalink)
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Have ever driven a cabover? Those things shake the life right out of you! I like the sound of the old 2 stroke Detroits, but sure wouldn't want to listen to one for hours on end.
And yes I have driven cabovers. Rough riding bitchs!!!
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Old 03-26-2012, 12:40 PM   #13 (permalink)
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Here one pulling a hill wrecking your eardrums with awesome!
Detroit 6-71 in GMC Crackerbox pulling a hill - YouTube
On the related bar I found this, best video I've seen on youtube for shifting a truck tranny.
'76 Ford 9000 straight truck - YouTube
5:40 is the start of the shifty part.
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Old 03-26-2012, 06:09 PM   #14 (permalink)
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FYI, an air ride retro-fit for the cab does wonders on cabovers. A place I used to work had about 90% Freightshaker cabovers. We retrofitted several with air cab mounts and it made them MUCH better trucks to drive.
Travis..
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Old 03-26-2012, 06:56 PM   #15 (permalink)
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FYI, an air ride retro-fit for the cab does wonders on cabovers. A place I used to work had about 90% Freightshaker cabovers. We retrofitted several with air cab mounts and it made them MUCH better trucks to drive.
Travis..
ANY TIME YOU SIT OVER THE FRONT AXLE THE RIDE WILL SUCK....it's like that old saying you can only polish a turd all you want but it's still a turd. Riding over the steering axle sucks period.
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Old 03-26-2012, 06:58 PM   #16 (permalink)
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drove one of those back in the late 70's, don't remember it being that bad a ride. strech the frame put on a 26' box, air ride it, weed burners to get the scream out your ears be a nice old truck
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Old 03-26-2012, 10:10 PM   #17 (permalink)
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ANY TIME YOU SIT OVER THE FRONT AXLE THE RIDE WILL SUCK....it's like that old saying you can only polish a turd all you want but it's still a turd. Riding over the steering axle sucks period.
AMEN to that

there is a reason why "non-setback axle, long hood" rigs are the favorite OOp trucks; the closer you get in between the axles the better the ride.... its just simple physics. (same reason why IMHO "diesel pushers" suck )

length restrictions sometimes mandate COE`s ... and so do "max profit" oriented fleet owners (where the max freight capacity is more important then the comfort of the driver)
other than that i dont see any sane reason to sit on or in front of the steer axle

i agree that a crackerbox with a 2stroke is definitely cool and would be fun for a parade or around town, but long distance??? ; no thanks
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Old 03-26-2012, 10:14 PM   #18 (permalink)
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Have ever driven a cabover?
And yes I have driven cabovers. Rough riding bitchs!!!
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ANY TIME YOU SIT OVER THE FRONT AXLE THE RIDE WILL SUCK....
NO & NO. Stretched out COE air ride Pete I used to own rode very nice. I thought they all rode rough until I bought that truck. But, the pictured blue GMC will ride rough. Especially with something like Reyco 101 spring suspension.
Nice lookin ride there 'montecarlo31'.
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Old 03-27-2012, 06:13 PM   #19 (permalink)
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ANY TIME YOU SIT OVER THE FRONT AXLE THE RIDE WILL SUCK....it's like that old saying you can only polish a turd all you want but it's still a turd. Riding over the steering axle sucks period.
I never said it'd be limo smooth, just light years better than being rigid mount.
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Old 03-27-2012, 06:28 PM   #20 (permalink)
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A GMC Crackerbox is definitely on my list of 'dream' trucks
In that time period you were able to buy that style crackerbox with either a 6-71, 6v92, 8v71, 8v92 or 12v71 Detroit Diesel engines

In my opinion, the 6-71 and the 12V71 paired with that stylistic look of a crackerbox makes for a really nice show truck. Sure it may ride rough, but that's not why we love them. Those old Jimmy's were great trucks through and through. The natural aspirated (non-turbocharged) Detroits are louder, so if you want to run straight pipes there is nothing better than the sound of a 6-71N under load. N'remember, you cant quiet a Detroit Diesel, nor can you prevent it from leaking

I may be partial to those old Green Leakers, because I have quite a few of them

PS, I love those Dayton 5 lug hubs, they really make it a real truck

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Old 03-27-2012, 06:58 PM   #21 (permalink)
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So, has the OP gone looked at the said crackerbox?
Post up pictures! (please)
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Old 03-27-2012, 08:54 PM   #22 (permalink)
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ANY TIME YOU SIT OVER THE FRONT AXLE THE RIDE WILL SUCK...
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Old 03-27-2012, 11:22 PM   #23 (permalink)
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I went and looked. It was stuck in the weeds with massive over growth. All steel was rusted beat and the steering and brakes were toast. It was a sleeper with single rear. They also had an old busted up Astro with sleeper but it was beat to fuck. I would have paid 3 to 5 hundo but when the owner started talking about 671 take out prices I was sure he wasn't going to sell. Saying that it might run decent. It's a shit load of work to get it out and sell it just for the motor. Then transporting it 80 miles home and storing it is a whole nother ball game. I'm not too sure my HF cherry picker would even work for pulling a DD. Ahh, if it was cheap and out of the weeds maybe but the way it was sitting, pass.. It's still on my list for the future though!
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