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crew cab info ?

Discussion in 'The Garage' started by TWISTEDJACK, Mar 13, 2006.

  1. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    I went and looked at a 84' crew cab 2wd single rear wheel this weekend it said it was a 3/4 ton I thought that all of the crewcabs after 77 were rated as 1 tons. It this right or did someone just change the badges on the side.
     
  2. u2slow

    u2slow 1/2 ton status

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  3. dremu

    dremu Officious Thread Derailer Premium Member

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    Well, ratings are funny things.

    I have a '74 "C20" crewcab ... however, it has the thicker frame and narrow rear spring spacing characteristic of a 1-ton. It also has the same front and rear springs as a 1-ton single-cab.

    To get the 1-ton in a crew cab you had to go to the rear spring packs with the overloads on top.

    Anyway, while it's nominally a 3/4, it's a stout truck, and can be easily upgraded.

    -- A
     
  4. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Any idea what axle ratio it should have it has a 350 with a 4 speed.
     
  5. u2slow

    u2slow 1/2 ton status

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    3.21, 3.42, 3.73, 4.10, or 4.56 :D Did I miss any stock 14bFF ratios? (no semi-float in a crewcab ;) )

    Check the glovebox decal for "Gxx" or "Hxx" codes. That will indicate the axle ratio.

    3.73 or 4.10 are most common.

    Yep. 1-ton frame, with 3/4-ton springs & brakes. Basically a 'de-rated' 1-ton.
     
  6. dremu

    dremu Officious Thread Derailer Premium Member

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    Well, mine has the same brakes and springs as a 1-ton single cab. Odd, since it's a 8600 GVWR, but I think that was GM playing games with the DOT or CAFE or whatever even back then. A precursor to the "2500HD"'s you see now.:doah:

    -- A
     
  7. tarussell

    tarussell 1/2 ton status

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    Did your's have hydraboost brakes ?

    Tom
     
  8. R72K5

    R72K5 Banned

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    hydroboost has nothing to do with it, even some cars had hydroboost

    Gm did play funny with the GVRW requirements, especially with the 1/2 tons before 1980

    they were getting away with making heavy half tons and didnt have to emissions them as much as a regular 1/2 ton

    crew cab 20 series was always around in the second gen years, common,

    and in the first gen years 68-72 were the C20 longhorns and nine foot steps, no 67 longhorns made, late 68 was the beginning of them,

    they were built on the C30 chassis, just like the second gen c20 crews were

    same deal, just different gen
     
  9. tarussell

    tarussell 1/2 ton status

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    Hydraboost has a lot to do with it . I know of no C/K/R/V/ 30/3500 truck chassis that was built after 1973 that did not come with a hydraboost set up .
    For the most part H/B set ups that came on cars and lighter duty P/U's were diesel equiped and it was a vacum related need.
    I asked DREMU the question because I am curious if his C-20 Crew Cab came with a standard vacum brake booster like other C-20 CC's that I have seen.
    Hydraboost was not just a random option !

    Tom
     
  10. b454rat

    b454rat 1/2 ton status Premium Member

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  11. tarussell

    tarussell 1/2 ton status

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  12. R72K5

    R72K5 Banned

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    not every single 30 series has hydro, theres lots of 1 tons with vacuum power brakes,

    hydro was a brake option, didnt come with all drivetrain combos and such

    i have seen a few c30s with vacuum brakes, they are around

    like my 78 c30 i had and uhm many others,

    just because youve never seen it doesnt mean theyre out there,

    theyre quite common :D

    saying that all 1 tons were hydro is like saying that all 3/4 ton were FF axle and 8 lug

    you gotta remember, GM was odd, espcially with their gross vehicle ratings
     
  13. u2slow

    u2slow 1/2 ton status

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    My Dad's 79 C20 crew has a vacuum booster, and JB7 brakes. 2-pin calipers, and 13x2.5" drums. 8200# GVWR camper special.

    Some of the earlier (or possibly low GVW?) 1-ton SRW stdcab trucks had the JB7 brakes also... I haven't seen one, but seems to be a few people that claim they have them. :crazy:

    The '83 C30 SRW stdcab pickup I wrecked out had JB8 brakes (D60 style calipers, 13x3.5" drums).
     
  14. tarussell

    tarussell 1/2 ton status

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    Didn't mean to say that it was never made but I have seen a fair amount of these trucks in my life and have never run across one not equiped. As far as your comment that they are "very common" I doubt that - it seems that the norm is H/B and the exception is a low GVW 1-ton as u2slow just said.

    Anyway back to my original question to DREMU did your C-20 Crew Cab hace H/B ?

    Tom
     
  15. dremu

    dremu Officious Thread Derailer Premium Member

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    Nope, vacuum, JB7, I do believe, biggest non-Bendix calipers up front and 13x2.5" drums in the back.

    -- A
     

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