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  • 1 Post By 34_40
  • 3 Post By rspears

Thread: geering for ford 9 inch rear
          
   
   

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  1. #1
    tyler1967ss is offline CHR Junior sMember Visit my Photo Gallery
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    geering for ford 9 inch rear

     



    hi, new guy tyler here,recently purchased at auction 1967 chevelle with ford 9 inch rear super low geering, original 4 speed standard trans, 396 bb, rear tires are 255/60r15. can someone please tell me what to get for daily driver,ocational hiway gears? i like to order from summit racing, if you could recommend gears and part number that would be so great.thank you.tyler

  2. #2
    34_40's Avatar
    34_40 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 34 Ford 3W Coupe Replica
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    A simple SWAG on my part. 3.25 or 3.50 or 3.73 / but there are many variables - even things like tire O.D. make a difference.
    36 sedan likes this.

  3. #3
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
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    Those rear tires have an OD of just 27" and the stock 4 speed is a 1.0 final drive ratio. If you run 3.25 gears you'll be turning 2831rpm at 70mph. If you jump up to a 30" rear OD tire the cruise revs drops to only 2548rpm. If you drop down to 3.00 gears those numbers drop to 2613 (27's) and 2352 (30's) at 70 down the road. You've got to balance what you want for driveability, economy and performance.
    ted dehaan, NTFDAY and 36 sedan like this.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  4. #4
    tyler1967ss is offline CHR Junior sMember Visit my Photo Gallery
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    thanks, if i want to keep tire size, what should i get for gears to run about 2300 rpm at 70 mpr?

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