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Thread: 915 ZF ltd. slip drive flanges and bolts

  1. 08-30-2021, 03:11 PM #1
    rory gallagher
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    915 ZF ltd. slip drive flanges and bolts

    I'm in the process of freshining up an early 915 and converting it to a 916 for use in a 914..... that's almost half of the 'teen' prefixes !
    This trans has a ZF limited slip. Can someone tell me if this calls for special drive flanges ? I have 110 mm flanges that fit right in....
    part # 911 332 210 01 with 75 mm stretch bolts. Are these parts correct and compatable ?
    I'm asking because I recall some limited slips require impossible to find flanges.
    I am using 110mm wheel hub flanges too with special SwayAway shafts.
    TIA
    Rory
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  2. 08-31-2021, 07:58 AM #2
    Jon B
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    Quote Originally Posted by rory gallagher View Post
    This trans has a ZF limited slip. Can someone tell me if this calls for special drive flanges ? I have 110 mm flanges that fit right in....
    Yes, the ZF for early 915s requires flanges that are 5 mm longer than standard.
    I don't have the specific part numbers or dimensions at hand, but if you install and fasten a standard flange to the ZF it will seize on the diff housing.

    Jon B.
    Vista, CA
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  3. 08-31-2021, 01:08 PM #3
    rory gallagher
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    Quote Originally Posted by Jon B View Post
    Yes, the ZF for early 915s requires flanges that are 5 mm longer than standard.
    I don't have the specific part numbers or dimensions at hand, but if you install and fasten a standard flange to the ZF it will seize on the diff housing.

    Jon B.
    Vista, CA
    Exactly the info I needed !
    I compared the 110mm 915 ZF ltd. slip flange to a 914 ZF ltd.slip flange.....same length. A standard open diff. 914 flange is between 4-5 mm shorter.
    For posterity the 915 flange is part # 915 332 210 01 , standard open diff. 914 is 914 332 209 01 and 914 ltd.slip is 914 332 209 00
    Thank you Jon B !!
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  4. 08-31-2021, 01:24 PM #4
    gled49
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    Are u using 911 drive flanges in the 914/916 trans? I come up with 915 332 209 01 for open diff and 209 21 for LSD. The bolts are the same. We’re talking coarse spline parts here. Parts at right of pix are 915 open and LSD drive flanges, long ones are LSD.
    Flanges on left are open 911 and 915.
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  5. 08-31-2021, 05:43 PM #5
    rory gallagher
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    I assume by 911 you mean '70-'71 trans ? It's possible I am using them and didn't know it
    My 915 LSD flanges are 210 01 and 110 mm diameter with 61mm 'reach'. Is 110 diameter a standard 911 CV size ?
    My normal 914 trans with ZF LSD has the same length........... which is longer than an open diff 914 by about 5mm
    I have no example or part #s for open diff 915s
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  6. 08-31-2021, 06:42 PM #6
    gled49
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    I was referring to part numbers, are u referring to casting numbers. 61mm is correct LSD. The flange 2nd from left is 911(70-71) with thick seal shoulder, the rest are 915. I did lots of WEVO 915’s for 914’s, wish his kit was still available, they were great.
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