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Thread: What is a 902/1 trans?

  1. 04-12-2017, 10:27 AM #1
    TWJ
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    What is a 902/1 trans?

    I have a January build '66 911 (Solex carbs) that I am restoring. It has Transmission Number 227136 and is a 902/1. Since this car was a barn find and not drivable I haven't explored the transmission. Can anyone help me out with information on this?

    Thanks!
    '66 911 - Light Ivory | Early '66 with Solex Carbs
    '72 911T - Aubergine originally | now Bahia Red | "S" options | 2.2S P&C's
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  2. 04-12-2017, 10:58 AM #2
    stevesob
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    TWJ, are you certain of that Transmission Number? I don't see that number in any range in the Tech Spec book.

    Steve
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  3. 04-12-2017, 10:59 AM #3
    davep
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    902/1 was a very popular transmission type. It was the original 912 5 speed in 1965, used for both 911 & 912 in 1966 from the same serial series, used for both 911 & 912 in 1967 from separate serial series, and again in 1968 for the 911. A F M S X gears with 7:31 pinion & ring. Probably a typo in your serial; 221 instead of 227.
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  4. 04-12-2017, 11:10 AM #4
    TWJ
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    I have both the COA and the Kardex, they both agree with the 227136 number. ???

    So it's a 5 speed and not a 4 speed? I've seen information pointing to both. ???
    '66 911 - Light Ivory | Early '66 with Solex Carbs
    '72 911T - Aubergine originally | now Bahia Red | "S" options | 2.2S P&C's
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  5. 04-12-2017, 11:22 AM #5
    sithot
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    Nice "sort of short" ratio from the factory box. My '67 has one. A "Z" 5th would be nicer for the highway.
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  6. 04-12-2017, 11:26 AM #6
    davep
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    Sorry, you are correct part of series 221722 to 234001 for 1966.
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  7. 04-12-2017, 11:46 AM #7
    TWJ
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    Just to double check:

    5 Speed or 4 Speed?
    '66 911 - Light Ivory | Early '66 with Solex Carbs
    '72 911T - Aubergine originally | now Bahia Red | "S" options | 2.2S P&C's
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  8. 04-12-2017, 12:16 PM #8
    Jon B
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    Quote Originally Posted by TWJ View Post
    Just to double check: 5 Speed or 4 Speed?
    Yes, 902/1 is a 5-speed, as described by Dave. Not to be confused with 902/01, which is a 4-speed.
    The 227 serial range seems correct to me for a Jan/Feb 66 build date.

    Jon B.
    Vista, CA
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  9. 04-12-2017, 12:23 PM #9
    TWJ
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    AHHHH, thanks for the clarification Jon! That's where my confusion was coming from.
    '66 911 - Light Ivory | Early '66 with Solex Carbs
    '72 911T - Aubergine originally | now Bahia Red | "S" options | 2.2S P&C's
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  10. 04-12-2017, 12:57 PM #10
    NeunElf
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    The transmissions are all listed in the little specification booklet. Here are a few ratios:

    Transmission Type number of gears 1st gear 2nd gear 3rd gear 4th gear 5th gear ring & pinion
    901/0 5 AA 2.83:1 GA 1.78:1 O 1.22:1 U 1.04:1 Y 0.82:1 4.43:1
    902/0 4 A 3.09:1 H 1.68:1 Q 1.13:1 X 0.86:1 4.43:1
    902/1 5 A 3.09:1 F 1.89:1 M 1.32:1 S 1.04:1 X 0.86:1 4.43:1
    902/01 4 A 3.09:1 H 1.68:1 Q 1.13:1 X 0.86:1 4.43:1
    Jim Alton
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