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901 Final Drive Ratio

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Old May 8, 2002 | 02:50 PM
  #1  
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Juan Lopez
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Post 901 Final Drive Ratio

How can I find out which final drive ratio I have (without taking the tranny apart)? The car is a 1969 911S.

What about the gears? I know that a stock 67 S would have AFMSX how about 69 S?
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Old May 8, 2002 | 03:01 PM
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1969 911S has a 901/07 or a 901/13 gearbox both have same ratios but /07 is die cast and the /13 is pressure cast. The ratios are a-f-m-s-z with a 7:31 ring and pinion. The number should be stamped on gearbox, custom ratios were available and would have a different /XX stamped.
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Old May 8, 2002 | 04:39 PM
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Is there a database where I could find the other numbers? (that is if /xx is different than /07 or /13) I will check mine to see what I have.

Thanks so much. Juan
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Old May 9, 2002 | 01:22 PM
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Get yourself the "Porsche 69,70,71 911T,911E,911S Technical Specifications" handbook that Porsche publishes, available at your dealer or go to <a href="http://WWW.MY-Porsche.com." target="_blank">WWW.MY-Porsche.com.</a> This is a small pocket handbook, Porsche number 4210.20, with all information on serial numbers and other tech information. Otherwise email me with your trans number and I'll look it up.
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Old May 9, 2002 | 02:00 PM
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Thanks, will get the Tech Specs.

Juan
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Old May 9, 2002 | 07:08 PM
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I just went to My-Porsche and the Tech books are apparently no longer available. Too bad, they are a great source of information, I've been buying them for years.
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Old May 9, 2002 | 07:26 PM
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I have an excel spreadsheet that I got from <a href="http://www.stomskiracing.com," target="_blank">www.stomskiracing.com,</a> its set up for the 901 gear box, grab it frim the stomski site, or let me know and ill email it to ya
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Old May 9, 2002 | 08:10 PM
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Thanks guys, I downloaded the file. I also got the óne from Dr. Timmins (Instant G's which I can email to you also.

Juan
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