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Thread: Gear Set Swapping Input / Pinion?

  1. 11-09-2016, 05:54 AM #1
    Innovation
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    Gear Set Swapping Input / Pinion?

    Hey guys,

    Was wondering if anyone could shed some light on this... so I have a gear wheel set 23:28 'O' with a 'I' [input] being loose and 'II' [pinion] being fixed. This matches up in PET with 901-302-910-10. This would be a 4th or 5th gear in a 5-speed transmission up to 1971. The interesting, and confusing, thing is that if you go down in PET a bit further under 4-speed Sportomatic transmissions this same exact part number is listed for 3rd gear BUT it says 'I' [input] is now fixed and 'II' [pinion] is now loose. How does this work exactly if each gear is already designated to be either input or pinion [based on I and II]?

    I attached some images below of PET for reference.

    Name: 5-speed.jpg Views: 115 Size: 44.7 KB
    Name: 4-speed.jpg Views: 106 Size: 39.2 KB

    Thanks in advance for any light you can shed on the subject.
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  2. 11-09-2016, 12:28 PM #2
    ajwans
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    They are the same part, 905 drops the outboard first gear and all the other gears are moved down a spot.

    905 3rd is in the same position within the transaxle as 901 4th.

    andy
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  3. 11-09-2016, 12:56 PM #3
    Innovation
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    Quote Originally Posted by ajwans View Post
    They are the same part, 905 drops the outboard first gear and all the other gears are moved down a spot.

    905 3rd is in the same position within the transaxle as 901 4th.

    andy

    Ahhh that makes sense. Thanks Andy!
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  4. 11-09-2016, 01:00 PM #4
    Jon B
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    Quote Originally Posted by Innovation View Post
    ... so I have a gear wheel set 23:28 'O' with a 'I' [input] being loose and 'II' [pinion] being fixed. This matches up in PET with 901-302-910-10.
    You have a Sportomatic "O" 3rd gear, which is different than a 5-speed "O" 3rd gear. If the PET is indicating that the Sporto "O" input gear is fixed, that is incorrect.

    Jon B.
    Vista, CA
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