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Thread: What gear ratio

  1. #1
    Senior Member EXPERT BUILDER
    Join Date
    Dec 2002
    spring creek nv.

    What gear ratio

    Putting a stock 7.4L vortec engine in a s10 that is backhalfed with 33x18.5x15 street tires but will be putting some DOT slicks roughly same size..looking to run truck on 1/8 mile track only..forgot. Running a turbo 400..what rear end gears think be good for this combo and also need to find out what converter stall I need also..
    Last edited by hotrodharley; 02-26-2016 at 10:24 PM.

  2. #2
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
    Since this seems to be a dual purpose truck, you will have to decide which is more important. Engine speed on the highway or engine speed at the 1/8. Check out and there will be a calculator to figure out your rpm questions.

    The converter question is somewhat the same issue. Driveability or e.t. If you get to high of a stall speed you are going to hate it on the street. You will run a higher stall on the track only. Both ways probably 3000-3500 or so but not knowing anything other than size of your engine it's really only a WAG at it though.


  3. #3
    Moderator RACING JUNKIE Harbone's Avatar
    Join Date
    Aug 2007
    Blog Entries
    Big question is it strictly a track car or will it be driven on the street?
    If its strictly track and you are only going to run 1/8th mile I would put the tallest gear possible in your carrier or you will never shift into 3 gear with that Turbo 400

    As close to "Normal" as I can get...

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