The Stovebolt Site Forums The Parking Lot '60-'66 Trucks 1966 Crew Cab Heavy Duty 1-ton(1-1/4 ton?)

I'm in the planning stage of building a 1966 GMC heavy-duty 1-ton(maybe a 1-1/4 ton?) crew cab dually. I want to use a 478 GMC v-6, a fuller FSO-6406a 6-speed manual O/D transmission, a dana 70hd or dana 80 rear(with 3.55, 3.73, or 4.11 gears). Because the 478 weighs a lot(925 lbs dry!) I wanted to know if a 73-91 1-ton coil spring suspension and frame are stout enough for this engine and trans. If not, I would like to know if a p-30(?) front suspension and frame would be sufficient using either the coil or leaf spring front end. I've been partial to the 19.5" wheel with the 5/10 lug on 7.25" pattern, but it's not absolutely necessary. I'm looking at using 32-33" diameter tires. I want to use this rig strictly for towing 22,000 or less pounds cruising around 65-75 mph on flat land. I plan to use this rig to replace my 86 chevy crew cab 1-ton dually that has a 454, th400, 4.11 rear. The bottom line is that I want an older GMC equivalent(more or less) of a new f-450 pickup. Any help or advice is greatly appreciated.

Mike

Long live the V-6!!

heck i just wanna see a picture of the cab! Love the idea! timbuk

You should call it a c-450 -haha

How about this, GMC and Chevrolet both built a 1 1/2 ton truck from 1960-1972 that used the standard light truck sheetmetal, as well as a beefed up version fo the 1 ton ifs. I don't know how common they were, as it seems that they built 1 1/2 tons in some of those years with the Big Bolt sheetmetal and I beam axle, too. I've seen a few, they're kind of neat as they look like a regular C30 duallie with a long wheelbase at first, but then you notice the odd bolt pattern and size of the wheels.

Yea it was called the GMC "3000" or Chevrolet "C/K-40" . . .

1.5T ? i thought they where 1.25T's ? .

Mike

I've seen pics of them like this one http://www.6066gmcguy.org/GMC3000.htm. I'm building one from scratch and plan on using disc brakes, power steering, air conditioning, etc. My goal is to make it look like something that GMC may have produced in 1966 if the pickup truck market was like it is today.

They are Awsomely strong brute force truck's, i know i have hundred's of load's that weight 22,000LB's . . .

Just drop 22K-lbs on the ball hitch and roll on down the road 60mph on level ground topping the steepest grades at 53mph . . .

Never seen this truck lose more then 7mph climbing hill's mostly only 1-3mph drop in speed.

But my truck is equipped with a Government rebuilt 379 V-6, flat top piston's netting 8.6:1 compression, magnum intake, heads ect.

Dynoed:
175hp@3,400rpm & 388tq@1,800rpm at the fly wheel 12 or 13 years ago . . .

Mike

It would be nice if i had a GMC 3000 to start with, but I dont. I just need to know if a 1973-1991 Chevy/GMC crew cab 1-ton frame is even stout enough. Or do I need to use a P-chassis that used the heavier duty front and rear end.

http://i249.photobucket.com/albums/gg224/timbuket/100_0318.jpg a shot of my crewcab