new here need help please

Discussion in 'Tech Discussion' started by interceptor78, Mar 20, 2017.

  1. interceptor78

    interceptor78 Junior Member

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    so I bought my first square body today:party36: question I need a frame what years or trucks will work or inter change with little mod same go's for rad support inner fenders and cab thanks' for the help truck is a 83 gmc c30 dully dump truck
     
  2. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    I would think the best frame candidate is a 1981-87 C30 complete chassis if it's a standard cab. 1981-91 if it's a crew cab.
     
    Last edited: Mar 20, 2017
  3. interceptor78

    interceptor78 Junior Member

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    it is a reg cab thank you what about the rad support cab and inter fenders what truck and years inter change?
     
  4. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    In yours, you'll need an '81-'88 quad headlight core support if that's what you have or an '81-'88 single headlight core support if that's what you have. A correct core support from a 1988 vehicle will come off a Suburban, Blazer/Jimmy, or crew cab and pickup trucks for all the other years. Inner fenders will interchange between a 1981-1991 square body.
     
  5. interceptor78

    interceptor78 Junior Member

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    will this work ??

    I found a 85 chevy c30 one ton truck but it is a single wheel truck rears might be diff but I have a good rear frame should work?? rest of the parts will thanks for the help so far
     
  6. 87silveradok20

    87silveradok20 Full Access Member

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    post up some pictures of what you have and it will be easier for us to advise you. Are you intending on keeping the dump bed? If so, how long is the dump bed? Do you want to convert to 4x4? If you are going to basically get an all new truck other than the bed, i woud advise to find a c&c truck that is close to what you want and swap the bed, that way all your vins line up and what not.
     
  7. CSFJ

    CSFJ Supporting Member Supporting Member

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    One other possibility here too, is was the truck originally a cab an chassis truck before the dump bed was installed? I know those frames were a little longer than a standard pick-up, and there may be a difference in frame width also. I'm not 100% on that though.
     
  8. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    Very true. The VIN will have to be cited on whether it was a chassis cab or not.
     

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  9. 87silveradok20

    87silveradok20 Full Access Member

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    i don't believe the frame widths were different but the rear frame of a cab and chassis is flat i believe with no hump for the rear axle.
     
  10. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    Crap. Forget all of that. I forgot that the newer VIN's don't tell you if it's a chassis cab. It did on the Action Lines and the squares up to '80, I think. Check for an RPO code ZW9. That's the only one I could find affiliated with chassis cab/pickup box delete.
     
  11. CSFJ

    CSFJ Supporting Member Supporting Member

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    I can't recall frame differences exactly, but I do know there was something different on the rear axles, either with spring pearch spacing or overall width.
     
  12. 87silveradok20

    87silveradok20 Full Access Member

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    The rear axles themselves are skinnier for a c&c dually. They are actually skinnier than a single wheel rear end.
     
  13. Craig 85

    Craig 85 Full Access Member

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    I'm not sure if that's totally true. I had an '87 CC dually. The rear inner tires tracked with the front tires. The rears stuck out the width of the tire and wheel assembly. I have seen dually tow trucks and dump trucks with a narrowed rear ends similar to the pictures below. The last picture is what it looks like with one of those rear ends under a standard fleetside bed.

    [​IMG]
    [​IMG]
    [​IMG]
     
  14. 74 Shortbed

    74 Shortbed Full Access Member

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    Yes you are correct, "dually" rear ends are the same as single wheel and the outer wheel sticks out, tow truck type are narrower, if you draw a line from the center of the front tire to the back, the line will be directly in center between the two tires, friend of mine converted his C20 to a dually and used a rear end from a dump truck(it was free)and it looked funny when it was done, so we put his beside my dually and started measuring and backing plate to backing plate was narrower on his(don't remember the numbers now been a long time) and his front wheels were in the center of his rear wheels.
     
  15. 87silveradok20

    87silveradok20 Full Access Member

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    I guess i shouldve put it this way. A 14 bt dually axle is skinnier than a 14 bt single wheel and a dana 70 is wider than a single wheel 14 bt (I think). The 14 bt dually is what is most commonly found in c&c trucks
     

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