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Join Date: Nov 2017
Location: Qatar
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Weird issue with my newly installed 930 transmission.

I'm getting close to buttoning up with my 930 transmission transplant. Everything went very well and all seems right, except when I came to torquing down the axles to the trans, the manual says to tight them down to 30 Nm, but then I've noticed that the axles don't rotate opposite to each other as an open diff. usually doing (mine is open diff), but they rotate at the same direction instead, I have also noticed that when I loosen the passenger side axle bolt the issue is gone and they act as normal. I thought the passenger side axle seal may press against it so I removed it without solving the problem. Anyone got any suggestions??

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-1987 Carrera Coupe,
-1977 911S with a Euro 3.2, single GTX3584 turbo, 930 4 speed trans, Microsquirt engine management.
Old 10-02-2020, 05:52 PM
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Any resolution, is this still an issue?
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* 1980 911SC - Turbo conversion, 930 gearbox, Bitz MS-II EFI, Carerra intake, 2380lbs
Old 10-06-2020, 12:22 PM
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Originally Posted by flat6pilot View Post
Any resolution, is this still an issue?
Unfortunately I still can't figure it out, I found that the flat area after the seal surface is touching the carrier housing only on the passenger side (the area showed in this pic :



As a temporary solution, I put a a couple of washers at the end of the flange to move it a way from the carrier.
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-1987 Carrera Coupe,
-1977 911S with a Euro 3.2, single GTX3584 turbo, 930 4 speed trans, Microsquirt engine management.
Old 10-06-2020, 08:40 PM
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Is that the stub axle you are using? That requires a matching early diff. It’s shorter than the flat ended flanges used 78 and on.
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Old 10-09-2020, 06:16 AM
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Probably a dumb question but there is no spacer between either of the driver flange and the carrier? When setting up the diff I add shims to remove the slop in the spider gears. I could see how that might cause the concern your having

Old 10-13-2020, 07:57 AM
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