C40-c70? 67-72
 

I was thinking about restoring an old heavy-duty truck from 67-72 and I really dont know much about them. What engines came in them? the same as the normal C10-30's? what are the GVW's? what wheel bases are there? are the cabs that same as normal C10-30's? Any info is nice to know.

Re: C40-c70? 67-72
 

They could have 350s,I assume smaller V8s too,V6s,Seen one or 2 inline 6s,all the way up to tall deck big block motors...The cabs are similar but no matter the year,they had the small back window like '67 10-30 series..The floor tunnel,and firewall area are also different.The doors are the same,but the there is a notch in the front of the doors on them for the fenders where the smaller trucks don't.I want to someday have a C/40 +.I found a real nice original paint one nearby for $1500 and there is many old grain truck 67-72 C/40+ trucks running around in rougher shape.During the harvesting times,you see a whole bunch of them running around,here.I'd really like to have one with the NAPCO 4wd conversion though.

Re: C40-c70? 67-72
 

I ahve seen them with a 283. Also when they say 4 +2 trans, im thinking they mean 4 speed trans and 2 speed rear-end. am i right?

Re: C40-c70? 67-72
 

Yeah,4spd w/ 2 speed rears

Re: C40-c70? 67-72
 

I have also thought about doing one of these but in a top kick style. I would build a crew cab (4door) with a fleet side bed w/ step fenders as needed to cover teh duels. I would then run a Cummins diesel and alison trans or somthing. Change it over to 10 lug rims and have one heck of a trailer hauler:)

Kevin
LFD Inc.

Re: C40-c70? 67-72
 

I like that idea Rokcrln

Re: C40-c70? 67-72
 

I have a 67 C-50 wrecker. Like the other trucks, 67's had no side markers. Mine has a GVWR at 19,500 and came with a 292 L6/ 4 speed/ 2 speed rearend.

These bad boys look absolutely awesome converted to a dually pickup!:metal:

Re: C40-c70? 67-72
 

They already have a 10 lug pattern, but they only use 5 lugs on the front. The rear has 10 lugs. A 4 door C/40 - C/50 would be so sweet - and we all know you could do it!!;)

Re: C40-c70? 67-72
 

To be correct,these are known as medium duty trucks.HDs are the 80-series and up.They had 292,current SBC(not 307),366BBC,tall deck BBC,and maybe a Detroit diesel?

Re: C40-c70? 67-72
 

Re: C40-c70? 67-72
 

So did 40-70 come with the diesel or only the 80 up (90?). Alos what dose it mean tall deck? longer rods or longer stroke?

Re: C40-c70? 67-72
 

longer cylinders

Re: C40-c70? 67-72
 

The 366 and the 427 are both tall deck, truck only motors.

I *think* the Detroit Diesel available was the 4-53. There may have been others, but I have definitely seen a (year unknown) C70 with a 5 speed and a 4-53.

Re: C40-c70? 67-72
 

Here's the standard and optional offerings through C60 for 1969;
http://i134.photobucket.com/albums/q...r/IMG_1160.jpg
P.S. The model 13680 was the El Camino.

Re: C40-c70? 67-72
 

The DH 478 listed is the infamous Toroflow. It was a diesel version of the GMC V-6. Rare now, and very tough to find parts for. GMC didn't make a version of this medium duty truck (with the 67-72 pickup cab) until 1970. The '70-'72 GMC's would have offered all the Chevy engines, plus the GMC V-6.

Re: C40-c70? 67-72
 

i've wanted to do one of these for a while... with a sexy stretched '71-'72 style eggcrate grille... :cool:

Re: C40-c70? 67-72
 

That`s pretty much what the GMCs had.Find one of those.

Re: C40-c70? 67-72
 

I just found a cab and chassis along side the road in a farmers field with most everything still on the truck. So I stopped to see what was left since it had been retired many years ago...I noticed it still had the dash cluster...Then I noticed it was the detroit under the hood...The dash cluster had the factory air gauge and a factory diesel tach which went up to 4k. Way cool! It also had the radio delete...I could not find the owner so maybe I will check it out on my next trip.

A good friend of the family bought a 70 GMC 2 ton and 70 GMC 1/2 new for his business. The 2 ton had a 350 2bbl with governer. Excellent motor for hot rodding as it had the 4 bolt mains and even thought it had the 2 bbl it had large valve heads. Only problem with the small blocks in the bigger trucks is they worked there ass off and rarely saw 50k miles before needing a rebuild or replacement as the rods tended to exit the oil pan when the engine was done. :metal:

Re: C40-c70? 67-72
 

So the c40 is a 1.5ton? or a 2 ton? And im seeing a few diferent length of trucks, dose anyone know the diferent wheelbases. Also ive seen alot of 4 speed trucks and a few 5 speeds, are there any tree speeds?

Re: C40-c70? 67-72
 

To my knowledge there were no three speeds, unless some of them got Autos. I have seen an auto in one though. I actually couldn't tell what the different wheelbases are, but I'm pretty sure there nhever any of the made short enough to put a pickup box on directly.

Re: C40-c70? 67-72
 

Here's a Napco 4X4 GMC dump.

Re: C40-c70? 67-72
 

Did the truck come stock with 4 wheel drive?

Re: C40-c70? 67-72
 

Nope..no 4wds in one ton or larger trucks..That truck being a NAPCO means its a converted to 4wd truck using NAPCO's conversion.The NAPCO 4wd trucks are rare.

Re: C40-c70? 67-72
 

They were converted when they were new by a company named NAPCO. Here's some history on them.

http://www.napco4x4.org/

Re: C40-c70? 67-72
 

One of our neighbors bought one of these years ago (mid 70's) that had swallowed a valve. Remarkably, there was no damage to the cylinder wall. They replaced the piston and both valves in that cylinder and ran it for years until it finally spun a rod bearing. Slow as snot but didn't know what a load was.