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'Close ratio' question

Discussion in 'U-shift em' started by Fullsize4speed, Jan 20, 2009.

  1. Fullsize4speed

    Fullsize4speed Well-Known Member

    I have heard the term 'close ratio' used for the late 60's M-22s and so on, but never with the 64-era BWs. I was reading the service manual on my 64 Wildcat stick car, and it states the BW trans was a close ratio, with the 1-4 ratios being 2.20, 1.64, 1.31, and 1.00 respectively. So, my question is, what kinds of ratios makes a trans a 'close ratio' vs a non close ratio? Are these BW ratios similar to the Muncies?

    Just curious.

    Thank you,

    Matt
     
  2. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

  3. CJay

    CJay Supercar owner Staff Member

    If you want to compare, here are the Muncie ratios-

    M20- 2.52, 1.88, 1.46, 1.00

    M21- 2.20, 1.64, 1.28, 1.00

    The gears in your Borg Warner are very close to the M21, so I woulds classify it as a close ratio. GM used the 21 on cars with 3.42 gears and numerically higher. And naturally, the 20 was used on numerically lower final drive ratios
     

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