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Britain Smith's Avatar
 
Join Date: Apr 2003
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915 Tranny in Early Chassis

I have heard that in order to fit a 915 tranny in an early chassis ('69) the center tunnel needs to be raised slightly. Can anyone elaborate on this one? How much do I need to raise it and where? I have the entire interior stripped out now and I can do it now before it all gets painted.

-Britain

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Old 01-29-2004, 03:42 PM
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I replaced my 901 with a 915 in my 71t and did not move the tunnel.
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Old 01-29-2004, 03:55 PM
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Hmmm, I wonder if the earlier years was any different. Anyone have any experience with this?

-Britain
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'69 912 w/ 2.3L Type-4 Turbo Engine
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Old 01-29-2004, 03:58 PM
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no need to move the tunnel, you just need to have a 5lb sledge handy in the event you need to make a little wiggle room.
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Old 01-29-2004, 04:35 PM
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I have a '69 chassis with a 915. Do a search on the database using the search word, "BFH". Opps, I forgot. The search engine doesn't like short "words".

Small sledge or large ball-peen hammer will do. Remove the nose housing from the gearbox, temporarily mount it on the transaxle mount, then use this assy. to see where and how much you have to smack the sheet metal. It's not much, but you want some clearance.

Sherwood
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Old 01-29-2004, 06:35 PM
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I installed a 78 915 in my 71 tub. I had to bump out the top of the tunnel and also the left side which included removing a bracket that holds the charcoal canister lines. They only needed to be moved out about 3/8" for clearance so the tranny does not rub the tunnel.

Sherwood makes an invaluable suggestion about removing the front cover. don't forget to secure the reverse pin.
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Old 01-30-2004, 09:28 AM
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Hi

I put a 915 trans in my 1970 tub, as the other guys have stated , just get a 5 lb hammer and from underside of car, dent up the hump on the driver side a bit for clearance, i guess i made a bump about 1" high to clear the trans, as you dont want any trans to body noise hitting bumps and stuff ..

- Joe -
Old 01-30-2004, 01:22 PM
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Did any of you guys have to change the CV joints to match the flanges on the tranny?
Old 01-30-2004, 10:26 PM
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Randy,
Matching inboard/outboard CV joints could be a challenge. I happened to upgrade to the same year alloy control arms at about the same time so the drive and axle flanges were the same (6 bolt, - 8mm). If you mate a late 915 to an early axle flange, the outer end should be 4-bolt; the inner end the later 6-bolt pattern. If it's an early 915 (prior to '77) the early CV joints should bolt in. One could also swap out the gearbox drive flanges so both CVs are the same. In addition:

Dan @ CarsInc provides this data:
There are least 4 style axles, plus flanges that attach at the Trans had
either fine splies or coarse splines. Fine splines were used in LSD gearboxes.
69-77 4-10 mm X 48 mm bolts and two pins per CV joint
78-83 6 - 8mm x 50 mm bolts per CV joint
84-86 6-10 mm x 50mm blots per CV Joint
87-89 6-10 mm x 50mm bolts per CV joint (No bolts used on outside CV
joint). However these years used the G50 gearbox.

And in one of Wil Ferch's threads:
"I'm quite sure that around late 84 or early 85, there was a transition period where you may find either 8mm or 10mm bolts, using either a 100 mm or 108 mm axle flange."

That's the extent of my knowledge base when in comes to CV joints. Hope this helps.

Sherwood
Old 01-31-2004, 12:16 AM
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The transition froom 8mm to 10mm bolts occured in mid-1985 according to the 911 Parts and Technical Reference manual.
-Chris
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Last edited by ChrisBennet; 01-31-2004 at 08:11 AM..
Old 01-31-2004, 04:15 AM
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I also swapped the Al control arms from the 78 donor at the same time as the tranny update.

If you keep the steel arms you will have to match the inner cv joints to the tranny and the outer to the stub axles.

This can be done by changing cv joints on the half shaft to match the existing output flange on the tranny, changing the stub axle (change rear wheel bearings at the same time) or swapping the output flanges themselves. Just make sure they match up. I usually favor swapping the cv joints themselves as you can repack or replace them during this procedure. Sherwood has included a great list that summarizes the bolt patterns.

This is a great time to upgrade the Al arms and makes the swap simple.
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Old 01-31-2004, 07:41 AM
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I am actually trying to go the opposite way -- a 901 into a 1973.5 911....

I've found that the 901 has some sort of lip on the drive falnges and requires a smaller CV joint than the ones I have.... I do have later Al arms (from a '77) but my stock '73 CV's and half shafts bolted up fine to it.

The output flanges inside the trannies do NOT swap -- the internal splines inside the trannies are completely different.

Old 01-31-2004, 11:40 AM
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