85 gmc3500. few questions

[beatermule]

85 gmc v3500, 6.2, sm465, d60 front 14bolt full float rear, 4.56 gears, currently ugly flatbed, was a dump body before that, im assuming its a cab/chassis frame then? im ditching the flatbed, but i want to know if an 8ft bed will fit on it? or do i need to run a dually bed? also, if i remember correctly i can take the dually wheel adapters off the front and just use regular 8 lug single wheels all around? or do i need to swap the front adapters to the rear to get the right spacing?last question, whats the biggest tire i can run on the stock dually rims without them rubbing eachother in the rear? thanks for the help guys!!

 

[nvrenuf]

A wheelbase length will probably answer the cab & chassis question, long bad pick ups are 131.5". Anything different (usually bigger) than 131.5" would indicate it being a c&c truck. Also, c&c's usually have straight frame rails as opposed to the typical "hump" over the rear axle.

On a king pin D60 there are no dually adapters that can be removed, the dually extension is a cast part of the bearing hub. To swap to srw wheels will require swapping the front bearing hubs (only) to srw type.

If the truck is a c&c, you need to measure the wms of the 14 bolt to determine if it will "fit" the bed correctly - some have a narrower wms to fit under a tool body, etc. Either way the 14 bolt will not be wide enough for a dually bed, that would require a D70HD swap or big wheel spacers on the 14 bolt.

 

[thatK30guy]

Check the RPO sticker in the glove box. It should list the wheelbase at the upper corner.

A cab-and-chassis regular cab truck will be 135.5" compared to the standard 131.5" long wheel base truck.

A c&c frame will not (most of them) have the holes for the regular bed on the tops of the frames. This should be your first clue to finding a c&c if the RPO sticker isn't in the g-box.

 

[1BEATK5]

He said 14 bolt. thats a good clue. 14 bolt dually is a c&c, dana 70 should be a regular dually

 

[thatK30guy]

I've seen a SRW c&c truck before.

Just because it has the narrow 14FF doesn't mean its automatically a c&c truck.

 

[1BEATK5]

he said it was a dually. and according to others on this site
14 bolt drw is c&c
70 drw is standard.
but i'm with you, i worked on a fleet of drw chevy trucks that had 14 bolts and where not c&c.
thats all i'm saying.

 

[thatK30guy]

I've seen just about all the crazy stuff GM ever came up with on their rigs. I've bought them, owned them, stripped them down, sold them, scrapped them, ahhhh...you get the idea.

I've seen them all.

 

[beatermule]

thanks guys, ill have to check it out a bit more once i get her home

 

[sweetk30]

c&c 14ff made to srw width = 2" spacers per side.

box will fit if you play your cards right on the c&c frame if you have that. just a few more inch's between the cab and box. wont look funky. and keeps the 2 for contacting in extrem frame flex.

pics and info on c&c frame with box on it. http://coloradok5.com/forums/showthread.php?t=256836&page=2

only prob he had was dump box on before had 4" of frame rails cut off so full custom bumper now and back hole each side on box to frame there is no frame. so 6 bolts only hold the box on.

 

[beatermule]

ended up not getting the truck. needed more then it originally looked. block was cracked where the starter mounts and front brakes are completely seized up and shot. still on the hunt for something new seeing how i was a dumbass and sold the k5 before i had a new truck---