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Thread: help with CV joint/axle determination

  1. 06-23-2014, 03:21 PM #1
    michaelaiellosr
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    help with CV joint/axle determination

    The gory details are: this is a project in boxes. All the gear is ready to assemble, except that I have to buy CV joints for the axles that came with the project. It's a 72 chassis that came with a 915 trans. The trans has a 100mm flange with 6 , 8mm bolts. The axles are 495mm long. The trailing arms are aluminum SC (brand new btw). The stub axle is 108mm , 4 bolt (10mm)with 2 locating pins. The stub axle fits into the hub fine. In trying to figure this out I am thinking that I might need 2 different Cv joints inboard and outboard. Any thoughts from those of you who may have run into this situation before?
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  2. 06-23-2014, 05:18 PM #2
    Fishcop
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    Michael, you'll have to decide on either 4 bolt/2 pin OR 6 bolt - you can't put a different CV on either end as the respective splines for each are different and no one makes a drive shaft with different splines on either end. It is easier to change the stub axle flanges that the gearbox output flanges. So essentially you need to source a pair of 6 bolt (later) axle flanges and a pair of 6 bolt drive shafts (72-86).
    John Forcier
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  3. 06-24-2014, 09:36 AM #3
    michaelaiellosr
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    Quote Originally Posted by Fishcop View Post
    Michael, you'll have to decide on either 4 bolt/2 pin OR 6 bolt - you can't put a different CV on either end as the respective splines for each are different and no one makes a drive shaft with different splines on either end. It is easier to change the stub axle flanges that the gearbox output flanges. So essentially you need to source a pair of 6 bolt (later) axle flanges and a pair of 6 bolt drive shafts (72-86).
    does this chart from a pelican post make any sense?Name: 911 CV Axle chart.jpg Views: 365 Size: 98.0 KB
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  4. 06-24-2014, 11:52 AM #4
    classic
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    Yep. What you've described is that have a stub axle that except #2 from the left (2 pin, 4 bolt).

    And your 915 flange has the #4 (108mm 6 bolt)

    You need these to be the same. The easiest option, as John suggested is to change the stub axle.

    Then you'll have both (108mm 6 bolt) just purchase shafts done.
    Tony
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  5. 06-24-2014, 03:51 PM #5
    Fishcop
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    The good thing about the 100mm/6 bolt is that most Carreras use this configuration and they are easy to source.
    John Forcier
    EarlyS #1987
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  6. 06-25-2014, 09:05 AM #6
    jerryg
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    Michael

    The chart is great. I have about 10 CVs and axles of various sizes and it is like matching items in a math problem in junior high.
    Jerry G

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    the situation."
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  7. 06-25-2014, 03:39 PM #7
    michaelaiellosr
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    It was confusing from the outset, but I think I have the fix. The flange on the trans is 100mm, 6 x 8mm which is an SC and later Carrera. The axle I have is from the same model car. I found a set of SC stubaxles and so now just have to buy the Cv joints. Case closed (I hope). Thanks for all the comments. Mike
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