66 GMC Heavy-duty 1 ton(1-1/4 ton?) Crew cab

[mehtwo]

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!!

[jonzcustomshop]

how are you going to do the cab? already have one, or building one?
here is a pic of a BIG crewcab

[mehtwo]

That looks cool! I plan on using a 1964-1966 cab for the front part and a 1960-1963 cab for the rear and modifying the 1960-1963 doors accordingly. I also don't want to have exposed rear door hinges.

Mike

[62gmc910]

I thought there would be a little more input than this one of the v 12 trucks is on http://67-72chevytrucks.com/vboard/s....php?p=3686007

[mehtwo]

?????

[62gmc910]

You asked if the front suspension would handle a big V6 , Rap'em Pappy and cayoterun run V12-702 engines