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3/4 ton and 1ton crewcab frame difference?

Discussion in 'The Garage' started by stoney126, Jul 14, 2006.

  1. stoney126

    stoney126 1/2 ton status

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    Hey all, What are the differences between the two? Size of the frame or shape?
     
  2. MTBLAZER89

    MTBLAZER89 3/4 ton status Premium Member GMOTM Winner

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    I believe 1 tons had bigger frames
     
  3. stoney126

    stoney126 1/2 ton status

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    There is a guy on pirate with a 3/4 ton crew with a 6 foot box. The way he did was cut off the spring hangers and move em forward. I was wondering If the dimensions or shape of the frame on the 1 tons would let me do the same:confused:
     
  4. 1BadK-30

    1BadK-30 1/2 ton status

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    i believe there all the same but the 1ton has a 9 inch tall frame and the 10 and 20 have 6 inch tall frames.

    someone correct me if im wrong.
     
  5. DavidB

    DavidB 1/2 ton status

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    SO a 1 ton frame would be kinda like a body lift?
     
  6. 77crewcab

    77crewcab 1/2 ton status

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    When it comes to the crewcabs the 3/4 and 1 ton are the same frame. On the reg cabs there is a different frame.
     
  7. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

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    My crewcab began life as a 3/4 ton. It has a one ton frame so they are the same.
     
  8. 77crewcab

    77crewcab 1/2 ton status

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    So did mine. I was trying to say that all 3/4 crewcabs are really one tons but in the regular cab versions that is not the case. Crewcabs are 1 tons reguardless of what badge is on the fender.
     
  9. DavidB

    DavidB 1/2 ton status

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    That's what I was thinking.
     
  10. u2slow

    u2slow 1/2 ton status

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    So far as the frames go, yes.

    The 3/4-ton crews got the lesser JB7 brake system common to 'normal' 3/4-tons.
     
  11. stoney126

    stoney126 1/2 ton status

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    Hmm so I dont need to cut the frame to fit the 6 foot box, looks like me and the tape measure are going to spending alot of time together :D
     
  12. dremu

    dremu Officious Thread Derailer Premium Member

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    As everybody else said, the frames on the crewcabs for 73-91 are identical for 20 or 30 series, likely due to the small number produced. They are the thicker/taller frame with the narrow spring spacing in the back.

    The regular cab trucks were manufactured in enough quantity to make variations cost effective.

    Note that my C20, a '74, came with the same stuff a light-GVWR 1-ton regular cab would have ... same spindles and brakes up front, same springs in the back, etc, but the extra weight of the body meant they had to back off on the GVWR.

    I upgraded it to SRW C30 just by changing the springs in the back to the nine leaf plus overload monstrosities.

    I then went nuts and did DRW, hydroboost, etc etc ... but that's another story.

    -- A
     
  13. dremu

    dremu Officious Thread Derailer Premium Member

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    Ah, is that what you're thinking about.

    Note that some crewcabs started out life as cab-n-chassis', and they have a different frame in back ... prolly easier to put a shortbed on those, as IIRC the frame is flatter / straighter.

    -- A
     
  14. u2slow

    u2slow 1/2 ton status

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    Same frame actually... just the narrower axle. ;)
     
  15. dremu

    dremu Officious Thread Derailer Premium Member

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    I thought there was the option for straight axle rails ... maybe that was the 88-91 NBS C/K C&C's. Aargh, my memory =))

    -- A
     
  16. u2slow

    u2slow 1/2 ton status

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    Tsk tsk :shame:

    I thought for sure you'd have committed those brochures to memory by now. :rotfl:
     

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