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Transmission Input/Output shaft

Discussion in '"Stock" Alpine' started by gordonra, Jan 21, 2007.

  1. gordonra

    gordonra Donation Time

    I have a Series V (Serial number 395018165) which indicates that the transmission should be of the 25 tooth variety, however I do not know what is currently in the car.

    I purchased a 25 tooth tranny from a fellow, but I'm afraid that I may run into a problem when the time comes to trade the old for the new. SS has the 25 tooth clutch, so that shouldn't be a problem.

    Was the output shaft all the same on the 10 tooth and the 25 tooth input transmissions?

    If they are different, how difficult will it be to locate a 25 tooth output yoke?

    Thanks for any help....

  2. Pumpkin

    Pumpkin Donation Time

    series and type tranny

    cast in to the main case on the left side, some on the right...is a set of numbers, MIND you they will be upside down on the unit. So with careful looking, take the info and write it down. (1), will be the manufacture or cast date..such as my OD tranny 15-1-6 , (2) next the style, mine 1DA 5778, (3) ,the big number will be the part number, mine 198083. There also may be a large letter above mine U.
    Then I believe it was IAN or JAN that knows all of this stuff. or someone in the alpines .net should know this info.
    Do have a good day
    Chuck in Portland
    ser ll 1725 , OD tranny
  3. Pumpkin

    Pumpkin Donation Time


  4. husky drvr

    husky drvr Gold Level Sponsor


    The fine spline input trans also has a fine spline main shaft which requires the matching yoke for your drive shaft. If the trans you purchased is from an Arrow ( Hunter range of cars ) it will also have different length ( longer ) input and main shafts than the Alpine gearbox.


  5. gordonra

    gordonra Donation Time

    It appears that there is a conflict in the responses.

    The transmission I have is supposed to be from an Alpine.

    I'll check the numbers next time I feel like crawling underneath....

  6. gordonra

    gordonra Donation Time

    Just in case, does anyone have a 25 tooth output yoke?

  7. Jay Laifman

    Jay Laifman Donation Time

    The stock SV 25 tooth tranny, or "fine spline tranny" has 25 going in and 25 going out. So, you do indeed need the matching driveshaft. It's actually easy to undo the 4 bolts on the rear flange of the driveshaft and pull it out and see what you have - without pulling out the tranny first.

    The stock SV OD tranny has 25 going in and 10 going out. That also needs a shorter driveshaft.

    How hard it is to find a 25 spline yoke? Don't know. But, back in 1979 ish, when my original fine spline driveshaft universal joint failed, taking the yoke with it, I could not find one. I ended up swapping in a SV course spline, which was easy to find. Now I have the SV OD tranny.

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