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Help - late model 915 tranny in a'72 911

I have a '72 911 with a 915 tranny that I recently replaced with a '84 915. The stub axles in the ’72 are approximately 110mm in diameter and have a 4 bolt, 2 pin mounting style. The output shafts on the ’84 are approximately 100mm and have a 6 bolt mounting style. My question is what to do with the CV axles shafts? I could buy ’84 style CV axle shafts but I’m not sure I can get them with ’84 CV joint one side and ’72 style joint on the outside. Thoughts?

Last edited by Motorhead77; 05-16-2018 at 06:45 PM..
Old 05-14-2018, 08:25 PM
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Later stubs.
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Old 05-14-2018, 08:28 PM
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In addition to later stubs, would I also have to replace the hubs (for a later style)?
Old 05-15-2018, 07:49 PM
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Early 930 flanges are the same larger diameter as your early ones and have the fine splines so they will bolt onto your late 915 transmission. They are 6 bolt. You can drill out two of the holes to the diameter to accept the roll pins and then use your current axles. You can get new billet 930 flanges from California Motorsports.
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1969 911 ST 3.8 EFI ITB - Irish Green, 1973 911 RS tribute 3.3 turbo - Gulf Blue, 1974 911 3.6 - Black, Beck 904 2.8 project - Silver, 1996 993 C2 - Polar Silver

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Old 05-15-2018, 08:14 PM
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Originally Posted by rswannabe View Post
Early 930 flanges are the same larger diameter as your early ones and have the fine splines so they will bolt onto your late 915 transmission. They are 6 bolt. You can drill out two of the holes to the diameter to accept the roll pins and then use your current axles. You can get new billet 930 flanges from California Motorsports.
Thanks for the information! Your suggestion would be a lot cheaper then replacing all the other components.
Old 05-16-2018, 06:02 PM
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Happy to be of assistance. Just did this with my ‘74 project into which I’m putting an ‘84 Euro 915 with cooler and lsd.
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2006 Forester STI - the parts hauler, 1992 BMW 325 Cab S52 M3 - The Scooter
Old 05-16-2018, 08:46 PM
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What Motor? EZ inexpensive fix.

What year 915? Look at 84-86 flanges. Late model Carrera axles(84-86 w/o stub splines) bolted up fine to 73 stub axles. Check the BC (bolt circle) "pattern". Get the $5 Grease Cups for the 915 side. Carrera axels are a lot stronger than early CV Joints with skinny axles. I saved my early CVs and skinny axles for 2.4 & 2.7.

My Carrera axles bolted up to the 1986 915 flange Used the grease cups on trans side to save misery. I used 73 gaskets on stub because joint cannot be breached after fastening. The stub axle pins line up into 2 of the Carrera axle bolt holes just fine. On the stub axles , used the 2-bolt locking plates and NEW Schorr Washers with NEW proper hard bolts and got down the road. Make yourself happy. Logical compromise is the art of merging.

Want to sell your mech speedo hardware and/or old 7:31 trans?

Last edited by Dodge Man; 05-18-2018 at 03:41 AM.. Reason: who cares
Old 05-17-2018, 07:34 PM
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