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Thread: What gear ratio?
          
   
   

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  1. #1
    40$tude is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 40 Studebaker Champion
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    What gear ratio?

     



    Rebuilding the rear axle for my 40 Studebaker build. 350 Olds engine, some performance upgrades but basically tame, and a 200R4 trans. 73-4 Camaro 8.5 rear. These old studes were a light car, 3300 pounds on the title. I'm sure the new drivetrain drives that up. Not looking to drag race, just a quick cruiser, limited hiway. Also going to posi. I'm thinkin 3:73? Thanks.

  2. #2
    Mike P's Avatar
    Mike P is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 68 Ply Valiant, 83 El Camino
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    3.73 sounds like a good match for the engine and trans.

    That being said, you probably want to keep in mind your tire size. cam RPM range and whether it's going on long interstate trips or be used primarily as an around town car and fine tune your selection from there. There are a bunch of on line calculators to help you figure the RPM at different speeds.



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    I've NEVER seen a car come from the factory that couldn't be improved.....

  3. #3
    40FordDeluxe's Avatar
    40FordDeluxe is offline CHR Member Visit my Photo Gallery
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    If you get a determined rpm you want to be cruising at a certain speed, here is a really nice tire height chart for when you are trying to find a certain size tire for your build.

    https://tiresize.com/tiresizes/

    Here is 1 link with several calculators on it. I like using their RPM calculator because it shows the RPM with over drives and without.

    https://www.randysworldwide.com/calculators/

    .
    Ryan
    1940 Ford Deluxe Tudor 354 Hemi 46RH Electric Blue w/multi-color flames, Ford 9" Residing in multiple pieces
    1968 Corvette Coupe 5.9 Cummins Drag Car 11.43@130mph No stall leaving the line with 1250 rpm's and poor 2.2 60'
    1972 Chevy K30 Longhorn P-pumped 24v Compound Turbos 47RH Just another money pit
    1971 Camaro RS 5.3 BTR Stage 3 cam, SuperT10
    Tire Sizes

  4. #4
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
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    3.73 is right on the money.
    .
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

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