SO what do we know about "Big" 4x4 (10x10's)

[greywuuf]

So I am looking at a C ( actually a JV) 70 with tandem rears and a driven front axle, and well I am kinda looking at doing some mods and stuff and am just wondering if there is any interest or knowledge base here about such a thing ?

I am all ready active in the heavy Haulers area, but the all wheel drive thing is more of a rarity there.

[1976gmc20]

Well, I'm sure that with enough time and money and work you could turn it into a lowered half ton

[greywuuf]

A lowered half ton would make decent wheel chocks for this thing.

[1976gmc20]

Originally Posted by greywuuf

A lowered half ton would make decent wheel chocks for this thing.

Yeah, I was just kidding, but it seems to be the thing to cut up 3/4 ton and bigger trucks to make some sort of street rod

What year is this beast? I used to have a 1965 C-50 GMC and a 1958 C-60 Chevy. The latter was an old Ma Bell winch truck.

Our VFD has a couple of AMC 6x6 trucks.

I for one am very interested in this sort of thing, but I don't know that I have any useful knowledge to share. Would love to see some pictures

[greywuuf]

not sure the exact year, has to be 68 -78, thinking early 70's
6v53 detroit
5 speed with 4 speed aux



and there are a few more pictures in this album
https://www.flickr.com/photos/404389...57653899216189

[greywuuf]

this is a better picture for Size comparison, thats a c50 on the left.

[IMG]JV701 by Greywuuf, on Flickr[/IMG]

[1976gmc20]

What does it cost to insure something like that in AK ???

I had to trade off my trucks because it cost more to insure them in CO than they were worth. The other guy had to pay for the low boy to haul them so all I got was an old tractor and a flatbed trailer.

Back in 1979 I was clearing building sites near Wasilla. If I had stayed in AK, I could have used something like that boom truck to yard/load/haul the cut logs. There was a fair market for birch back then for paneling. etc.

[greywuuf]

no idea, the guy that owns it now bought it for the boom and bed. I talked to him at the auction and offered to buy the truck, still waiting on the bed to come off, the plan is to single it and make a "toterhome"out of it, simple short popup camper and a flat bed for hauling a couple of sleds and the option of a decent 5th wheel.

[1976gmc20]

Probably way too much truck for that. A C-60 with adequate wheelbase should suffice, since your camper and snow machines would probably weigh much less than the crane and the flatbed (which presumably is designed to carry a heavy load also).

Also, even though heavy all wheel drive trucks are way cool, there really isn't much use for them. Are you really going to take it where you need all wheel drive? We hardly ever engage the front axle on our ex-military 6x6 trucks even for wildland firefighting - but use low range a lot. Then you have to consider recovery options for such a big truck!

When I was in Alaska in the late 1970s I found that there weren't really that many places where my K-20 was all that useful. Most of Alaska seemed to be either a somewhat developed road, or impossible bogs, inpenetrable forests, or glaciers. It wasn't like CO where there was a two track to the top of almost every mountain. A bunch of us did go up and glean some firewood from a fairly recent power line right of way - that was a lot of fun following a bulldozer trail

Maybe it's different now or different where you are .....

[greywuuf]

no, not so different, its either road or not ( swamp) but anything other than the road is closed anyway. I have wwII weasels and a SUSV for actual swamp travel, and No I will never come close to the 80,000 GVW that is has now ( thus removing one of the rear axles. but I WANT a Detroit, and if you remember it does snow here ( I am interior not Anchorage bowl ) and though I don't go "4wheeling" with ANY of my street rigs that front end is kind of nice to have in the poorly plowed turn arounds and trailside berms etc. since it is a recreational TOY for me anyway, why not have the "cool" one that makes me happy?

[greywuuf]

also registering it as an RV takes it out of CDL and commmercial insurance...plus saying I want to make a "motorhome" out of it gets it a pass from the wife.
and allows me to drive it occasionally as compared to having an uninsured CDL vehicle that I could never operate.

[1976gmc20]

Originally Posted by greywuuf

also registering it as an RV takes it out of CDL and commmercial insurance...plus saying I want to make a "motorhome" out of it gets it a pass from the wife.
and allows me to drive it occasionally as compared to having an uninsured CDL vehicle that I could never operate.

Yeah, I always wanted to build a chassis mount camper on my old 65 GMC after I got done logging with it, but alas it was never to be

It got about 10-11 mpg loaded or empty so I figured it wouldn't be too bad with the mere weight of a camper compared to logs.

[greywuuf]

Originally Posted by 1976gmc20

It got about 10-11 mpg loaded or empty so I figured it wouldn't be too bad with the mere weight of a camper compared to logs.

That is pretty good actually, I am assuming the '65 had to have a Big 6 in it ?
401/478 ? they were not known for their mileage anyway.

[1976gmc20]

Originally Posted by greywuuf

That is pretty good actually, I am assuming the '65 had to have a Big 6 in it ?
401/478 ? they were not known for their mileage anyway.

305 V6 / 4 speed

It really needed more gears for the way I was using it, but much of the time I was on back roads so it was okay. Out on a hill on the highway you couldn't stay in high, and when you dropped a gear you were rpm limited.

I had a semi-truck bolster with home made bunks on it, and a trailer with fixed bunk, hauling 20-25' long logs. I figured I was grossing about 25K including a home made hydraulic loader. It was supposed to be a "starter truck" but I never made enough money to graduate to something bigger.

[1976gmc20]

OK, I see your point - the engine alone is probably worth it

Worst thing down around Anchorage/Mat-Su was the ice which is a lot worse than snow. I drove school bus at Chugiak for a year and never had any trouble even in fairly deep snow even with bias highway tires. Ice was sometimes bad, though.

What kind of rear suspension does the C-70 have? A lot of those HD trucks have the walking beam suspension (either one pair of springs or four rubber pads) so you pretty much have to just find another rear axle/springs to convert to single axle. In fact I've known guys that found it easier to just cut the frame and weld in another rear frame/axle rather than mess with all the brackets.

At least you shouldn't have to lift it

[greywuuf]

Originally Posted by 1976gmc20

At least you shouldn't have to lift it

and it does not even have the big tires on it yet

these are like 53"

[greywuuf]

Originally Posted by 1976gmc20

OK, I see your point - the engine alone is probably worth it


What kind of rear suspension does the C-70 have? A lot of those HD trucks have the walking beam suspension (either one pair of springs or four rubber pads) so you pretty much have to just find another rear axle/springs to convert to single axle. In fact I've known guys that found it easier to just cut the frame and weld in another rear frame/axle rather than mess with all the brackets.

Yeah just read where ALL of this year/series trucks with tandems had hendrickson equalizing beam rears. i am Hoping it is a spring pack and not the rubber blocks. Should know more next week.

[1976gmc20]

Originally Posted by greywuuf

Yeah just read where ALL of this year/series trucks with tandems had hendrickson equalizing beam rears. i am Hoping it is a spring pack and not the rubber blocks. Should know more next week.

It doesn't really matter if you're going to swap in a single axle as the entire rear suspension would need to be replaced. Like I said before, it would probably be easier to just cut the frame and weld in the entire rear half of the donor truck.

The rubber pads suspensions were commonly used on log trucks. I think that they worked better in off camber situations with tall heavy loads.

[greywuuf]

Originally Posted by 1976gmc20

It doesn't really matter if you're going to swap in a single axle as the entire rear suspension would need to be replaced. Like I said before, it would probably be easier to just cut the frame and weld in the entire rear half of the donor truck.

The rubber pads suspensions were commonly used on log trucks. I think that they worked better in off camber situations with tall heavy loads.

I don't see why, if it all ready has a single spring pack mounted, why could you not remove the beam and u bolt the single axle where the beam pivot used to be ?

[1976gmc20]

Originally Posted by greywuuf

I don't see why, if it all ready has a single spring pack mounted, why could you not remove the beam and u bolt the single axle where the beam pivot used to be ?

That single spring is huge and designed to suspend the weight carried by two axles. I don't even know if you could bolt up a single axle in the middle of it - probably not without a lot of complication. I never heard of anybody trying it.

The walking beam set up is probably worth a fair amount to somebody who wants to upgrade their truck.

I worked for a guy that had two trucks at the time: a KW and a Pete. The KW was set up for logging (came from WA one of the big companies: Weyerhauser or GP ...) but the Pete had the proprietary air bag suspension. He made a deal with somebody that had a Hendrikson rear end truck and they literally cut the frames on both and welded them together to the different front halves. He also added a 4 speed brownie so the Pete had the same 13x4 gears as the KW. Some of the hills that had to be climbed with the kind of loads that he hauled, the original 13 speed Pete could not get started again if it had to be stopped for some reason, and you sure didn't wanted to even think about backing a load down those switchbacks!

So when he got done he had two almost identical trucks, both 350 Cummins, 13x4 transmissions, rubber pad walking beam rear end - the only difference was the cabs, KW vs Pete. With the 13x4 the lowest gear was down in the "bulldozer" range

[greywuuf]

I drove school bus in Glennallen, Valdez for a season or two as well, I am not really concerned about "needing" the 4x4 I just want it ! and yeah unknown on the rear suspension, not my truck and it was a year ago when it was at auction, did not think to look. I HAVE a leaf spring rear, C60 with Air brakes and a WAY short ( 135" WB) frame that might make a good donor for this project, but I still need to keep on this guy and get him to sell me the truck like he promised before I get to serious.

[1976gmc20]

Originally Posted by greywuuf

I drove school bus in Glennallen, Valdez for a season or two as well, I am not really concerned about "needing" the 4x4 I just want it ! and yeah unknown on the rear suspension, not my truck and it was a year ago when it was at auction, did not think to look. I HAVE a leaf spring rear, C60 with Air brakes and a WAY short ( 135" WB) frame that might make a good donor for this project, but I still need to keep on this guy and get him to sell me the truck like he promised before I get to serious.

My GMC was pretty short but not that short. I dunno exactly - maybe about 150" ??? 135" is about the same as a regular cab long bed pickup.

So that's why I had to use a trailer with it unless I only hauled 12' logs (had it set up that way for a while with an electric winch powered cable loader). It had been a utility truck originally. It would have made a good little dump truck too.

Is your C-60 complete? Not much of a deal to stretch the frame.

[greywuuf]

it was complete but broken when I got it, it is now complete and mostly unbroken but disassembled. the dealer new 427 short block is in my garage, heads are rebuilt just need to pick a cam and put it together, also it had a REALLY heavy Spicer 5 speed in it, and the shift tower got broken when it was removed, so I need one piece for that ( spicer 5756b) and I should probably go through the brakes and it could use tires

[IMG]C60 011 by Greywuuf, on Flickr[/IMG]



[IMG]Left by Greywuuf, on Flickr[/IMG]

[greywuuf]

yes it could be stretched, but my goal is NOT to have a toter home, my GOAL is to have a detroit, the toter home was just an easy way to register and justify it. the C-60 came placarded from the factory as 25500 GVW, ( even though it has a 19k rear axle and a 11k front?) so there is no issue driving it as it is.....Ideally it will get a holmes 600 on it.

[special-K]

Do you know what conversion is under this truck yet?