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Join Date: Jul 2010
Location: New Jersey
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what transmission do I need / short or long bell housing

I am getting conflicting information and just trying to clear some things up

the chassis is a 1974 coupe
engine is 993 turbo

Im being told I need a short bell housing, but what im confused on is aren't the 74 chassis and 78+ chassis the same? same mounting points etc,...
Old 03-04-2018, 02:46 PM
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Try sending Matt Monson a PM. He may know.


Sent from my iPhone while Driving
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Old 03-04-2018, 05:54 PM
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I'm sure Chris at turbocraft would also know. Very helpful guy and consistent contributor to PP.

Rahl
Old 03-04-2018, 07:05 PM
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Brando
 
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Short. Only Chasis that is longer is the 930 turbo. If you have a any other chassis you’ll need the short.
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Old 03-04-2018, 08:38 PM
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hmmm 993 twin turbo in a '74? WHOA....

I am working on a 78 SC/930 conversion. 3.3 turbo motor but the guy who originally built this left a 915 in, and it was totally worn out, ruined gears, etc, surprised he did not blow it.

after some research and talking to Quattrorunner, I am closing in on getting either a short BH (rare and expensive), or have a long BH 930 gearbox rebuilt/shorted.

good luck.
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Old 03-05-2018, 07:14 AM
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What you are being told is correct. The 74 and 78 911 chassis both require a "short bell housing" configuration if you don't cut the torsion tube.

It is not until the 1986.5- 911 Carrera with the G50.00/01 "Long Bell Housing" trans was used in the updated chassis. The later Carrera chassis included a revised torsion tube assembly giving clearance for the the deep bell housing 5 speed G50.

The 911 Turbo / 930 also had a deep bell housing from 1978-1988 with the use of the 930 4 speed. The turbo chassis is about an inch longer but still too short for the 5 speed G50.

Since you are installing a 993 Turbo engine than I would suggest a (1987-1989) 911 Carrera, G50.01 Transaxle and then have it professionally made shorter. You will have to get the bell housing and main-shaft machined.

The other options are to us a 930 4 speed or cut clearance or replace the torsion tube section. Sounds like a fun project!
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Old 03-12-2018, 09:45 PM
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