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Dually Gear Ratio Options

Discussion in 'The Garage' started by Poohbair, Apr 15, 2004.

  1. Poohbair

    Poohbair 1/2 ton status

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    I just bought a 79 Chevy 1 ton Dually 4wd, but I haven't seen the truck yet. It is a 350/4spd truck, not sure on Tcase. Someone told me that alot of the 1ton's w/ a 350 are 4.56 gear trucks???
    Does anyone know what gears the truck most likely would have? The guy selling it doesn't have a clue, and the curiosity is killing me since I can't go get it for a few days.
     
  2. wayne

    wayne 3/4 ton status

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    Most likely 4:10 or 4:56 and yes 4:56's were in a lot of them. /forums/images/graemlins/waytogo.gif
     
  3. Poohbair

    Poohbair 1/2 ton status

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    Sweet, I am kind of hoping it is a 4.56 truck! What is the difference between the dually rearend and the 3/4 ton FF14 that I currently have? If it is a 4.56 truck is it easier to swap the gears out of that rearend into my truck, or make that dually rearend work in mine and leave the gears in it?
     
  4. mountainexplorer

    mountainexplorer 1/2 ton status

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    Yeah, a good chance it has 4.56's. I had a '77 1-ton SRW Crew Cab that came factory with a SB400, and according to the factory option sticker, it had 4.56's originally.

    If that '79 is a Dually, I think it would be a Dana 70 rear, rather than a 14 bolt.
     
  5. kennyw

    kennyw N9PHW Premium Member

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    3.73, 4.10 and 4.56 were all optional gear ratios for that truck.
     

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