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Thread: Sportomatic Differential Question

  1. 12-15-2016, 08:32 PM #1
    Fishcop
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    Sportomatic Differential Question

    Can anyone tell me if I can use a an early (905) sportomatic differential in an 901 manual gearbox build?

    Cheers
    John Forcier
    EarlyS #1987
    1968 911 Race Car "Grun Hilda"
    1969 S/T interpretation "Blau Healer"
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  2. 12-15-2016, 09:52 PM #2
    Jon B
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    Quote Originally Posted by Fishcop View Post
    Can anyone tell me if I can use a an early (905) sportomatic differential in an 901 manual gearbox build?
    John, there are a few dimensional differences between 905 and 901 differentials and they are not, for practical purposes, interchangeable.
    I don't currently have a 905 differential to give you specific information on the differences.

    Jon B.
    Vista, CA
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  3. 12-15-2016, 11:26 PM #3
    Fishcop
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    Thanks Jon, I appreciate the advice.
    John Forcier
    EarlyS #1987
    1968 911 Race Car "Grun Hilda"
    1969 S/T interpretation "Blau Healer"
    Restoration Saga
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  4. 12-16-2016, 03:56 AM #4
    Frank Beck
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    John,
    I have some core 905 boxes.

    What exactly are you trying to do?
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  5. 12-16-2016, 04:10 AM #5
    Fishcop
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    Hi Frank

    Skinning a cat with a bar of soap I suspect

    I want to put my original 2.0t engine back into my 69t (which is currently running a 2.7 and 915). Car was originally a sporto, but I don't want it back in the car... I have a spare 66 901 with the early differential, so later 108mm drive flanges won't fit into it. I thought I may be able to transfer the ring from the 66 onto the 905 differential and put it all back into the box and keep the original output flanges/driveshafts.

    Basically I'm trying to work out what flange/driveshaft combo could possibly work with what I have... A '66 901 and shafts, '69 905 and shafts, 'and 82 SC 915 and shafts.

    I know I can buy a Guard and solve the problem, but the car is for sale...
    John Forcier
    EarlyS #1987
    1968 911 Race Car "Grun Hilda"
    1969 S/T interpretation "Blau Healer"
    Restoration Saga
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  6. 12-16-2016, 04:33 AM #6
    Frank Beck
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    Play Mr. Potato Head with a chop saw and TIG machine.

    We weld up all kinds of combos using a lot more hp than you're probably running.
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