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Thread: 901 Gearbox, Can anyone identify it?

  1. #1

    901 Gearbox, Can anyone identify it?

    Hi all,

    I'm looking for some help in identifying a gearbox I picked up. I don't know what car it come off originally but I'm trying to track down the spec. It doesn't appear in any of the lists I've seen either. Any help regarding the ratios etc, would be gratefully received. I was told it came off a '68T but that was third hand information at best.

    Type 901/05 Serial no. 3282139
    94mm CV flanges with 6 threaded holes (not 4 with 2 dowels). No LSD. It does have the "simplified" diff however, identified by the stud on the end of the CV flange bolt.

    I'm not totally sure if it has a mag or alumi case. It is a dull grey colour , with small white crystal deposits on the surface (light corosion?).


    Thanks for any help.

    Bruce.

  2. #2
    According to the serial number the tranny came from a 68' 911L.

    The type number 901/05 doesn't show up in the Porsche spec book and the standard tranny for a 68'L was a 902/01 (4 speed) same as for 68' normal sometimes called T.

    The gears for 902/01 are as follows.
    A 11:34
    H 19:32
    Q 24:27
    X 28:24

    So your tranny was probably an optional version. Probabbly a 5-speed.

    In searching Pelicans archive I found one person who had a 901/05 tranny. His car was a 68'L. No one could locate that type number either at that time but the owner guessed his ratios to be as follows.

    A - 11:34
    E - 17:34
    L - 22:30
    R - 25:27
    U - 26:25

    Here's a chart of some of the early trannies you might find helpful.

    Bobby
    71' Olive 2.2E Targa / Early S #491

    I've always considered the glass to be half full...that is until I reached middle age and realized that it is actually half empty.

  3. #3
    Quote Originally Posted by Bobboloo
    According to the serial number the tranny came from a 68' 911L.
    Interesting.
    In searching Pelicans archive I found one person who had a 901/05 tranny. His car was a 68'L.
    That might be me. I have been trying to figure out what the 901/05 gearbox is since getting my car, but the info above about the S/N matching the L is good news.
    My gearbox is an aluminum case, and I have not confirmed the gear ratios, but they are short. I am going to rebuild the box this spring, so I will know the ratios for sure then.
    Joe
    Now - 1993 C2
    Past - 1968 911L

  4. #4
    Hi Joe,

    That was you that showed up in the Pelican search. According to the spec book I have the serial number decodes as folllows.

    3282139

    3 = 6 cyl. 130 HP (L in 68')
    2 = 5 speed
    8 = 1968
    2139 = sequential number.
    Bobby
    71' Olive 2.2E Targa / Early S #491

    I've always considered the glass to be half full...that is until I reached middle age and realized that it is actually half empty.

  5. #5
    Great, thank you for the info!

    I just found a new reference to the 901/05,
    http://www.porsport.com/cars.htm about half way down under "1968 Sports Purposes 911L Rallye Car" is: "Built by Porsche with R roll bar, front and rear gravel / skid plates, green glass, special 901/05 gearbox"
    The website is owned by Rennman on this forum.
    Joe
    Now - 1993 C2
    Past - 1968 911L

  6. #6
    My silver 68 rally has a 901/05 LSD gearbox. I have not been able to find that designation either but someone once looked it up and it was designated as a "Customer special gearbox" whatever that means. I think I got that from Jim Logan. Jim could you dig that up for us?

    Don

  7. #7
    Thanks for your input folks.

    It looks like the ratios could be quite short, which wouldn't be the best but nevermind. I may consider a rebuild and pick up some different ratios.

    Can I ask, is the narrow CV flanges with the six threaded holes (no dowels) normal for this year? I thought before the 930 size they only used 4 bolts and 2 dowels.

    A note for anyone with this type of box (or similar). check the CV flange centre bolt. The small stud on the end (after the thread) wears away and then the diff explodes.
    Mine had a fair bit of wear and will be replaced.

    Apparently these are often updated with parts from 914 to remove the duff bits. I spotted this on the pelican forum.

    Cheers.

    Bruce.

  8. #8
    Most people dont know that when you run a Limited slip,,, you also need a pair of proper set of CV flanges, which are different in length. Using standard flanges will cause internal damage with a slipped Diff..

    Regards, Robert Gross

  9. #9
    Can I ask, is the narrow CV flanges with the six threaded holes (no dowels) normal for this year? I thought before the 930 size they only used 4 bolts and 2 dowels.
    No the 4 bolts with 2 dowels would be normal. The smaller diameter 6-bolt flanges didn't come along until much later.
    Bobby
    71' Olive 2.2E Targa / Early S #491

    I've always considered the glass to be half full...that is until I reached middle age and realized that it is actually half empty.

  10. #10
    Senior Member
    Join Date
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    Location
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    Posts
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    Later 901 transaxles (not 911 transaxles) have 6 Allen head bolts to mount the CV's to the flanges. Early 901 transaxles with Nadella's have 4 Allen bolts.
    1970 911S Coupe (Burgundrot) (sold)
    1967 911 Coupe (Light Ivory) (mostly gone)
    1966 911 Coupe (Sand Beige) (sold)
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    Other Early 911/912/914

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