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> Six vs four, Trans question
mepstein
post May 27 2021, 06:14 PM
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Please remind me how to tell the difference between a four and six transmission case. Thanks!
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76-914
post May 27 2021, 06:21 PM
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$2500 (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/lol-2.gif)
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IronHillRestorations
post May 27 2021, 06:28 PM
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They have a threaded hole for the throttle pivots shaft, and the shift mechanism at the tail isn’t like the 4cyl
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mepstein
post May 27 2021, 06:38 PM
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QUOTE(IronHillRestorations @ May 27 2021, 08:28 PM) *

They have a threaded hole for the throttle pivots shaft, and the shift mechanism at the tail isn’t like the 4cyl

I think the early fours also have the pivot hole.
What is the difference on the model number?
I just need to identify a bare case.
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Retroracer
post May 27 2021, 07:15 PM
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As I recall the casting is different along the centerline underneath - there should be an extra lump on -6 version, as well as a different part number?

Also, as @76-914 points out, $2500.

- Tony
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davep
post May 27 2021, 08:16 PM
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Three things that I look for are the serial # which is a 7xxxxxx # for a six, The serial is either stamped along the bottom rib or off to the side on a flat made especially for it, and the bell housing usually has a protrusion on the right side low down (perhaps a cable guide).
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mepstein
post May 27 2021, 08:39 PM
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QUOTE(davep @ May 27 2021, 10:16 PM) *

Three things that I look for are the serial # which is a 7xxxxxx # for a six, The serial is either stamped along the bottom rib or off to the side on a flat made especially for it, and the bell housing usually has a protrusion on the right side low down (perhaps a cable guide).



Perfect. Thanks!
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Cairo94507
post May 27 2021, 09:06 PM
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Here is what is should look like on a Six:

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davep
post May 28 2021, 10:28 PM
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QUOTE(Cairo94507 @ May 27 2021, 11:06 PM) *

Here is what is should look like on a Six:

Not all, but I would like to narrow the range down (a lot) from between 7500215 to 7501454; up to 215 I have photos of the serial along the rib as is usual for a 914 trans. I just need serial photos of many more six trans.
The feature on the case is also present on the early version:
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These were 911 trans cases albeit with the breather vent relocated.
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ClayPerrine
post May 28 2021, 10:44 PM
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That "Feature" on the trans bell housing on the sixes, and the loop on the side cover, are there because Porsche was using the same case on the 70 and 71 911, with the 225mm pull type clutch. That is the anchor for the end of the 911 clutch cable and the loop is the cable guide.

The ones on the fours were a Porsche design from 69, that was built by VW. And they have the markings to prove it. If you look in the bell housing on a 914-6 transmission, the pad that the ball stud is in is oval shaped. The clutch arm pivot on the 70-71 911 was mounted in a slightly different place.

You can combine a 70-71 911 trans with the pull type 225mm clutch with 914 side shifter parts and make a transmission that will work on anything up to a 3.2 engine using factory parts. The drawback is you have to use the 70-71 911 pressure plate and release bearing. And the release bearing is well over $300.00 for a new one.

But you do get a 914 that doesn't need a pulley on the side of the transmission. So the clutch tube in the chassis has no stress on it and is just a guide tube.

Yes, I know this works. I have one that I took out of my car still attached to a 73 2.4 MFI motor sitting on a dolly in my garage. I used a 76 911 clutch cable to hook it up.
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mlindner
post May 29 2021, 07:51 AM
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Not to go off topic of Identification but are gears and final drive the same. Thanks, Mark
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ClayPerrine
post May 29 2021, 07:54 AM
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QUOTE(mlindner @ May 29 2021, 08:51 AM) *

Not to go off topic of Identification but are gears and final drive the same. Thanks, Mark



The six has a GA second gear and a Z fifth gear.

The four has a F second gear and a ZD fifth gear.


Clay
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mepstein
post May 29 2021, 11:23 AM
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Found one in my stash. Is this a six case or a converted 911 trans?


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gms
post May 29 2021, 12:26 PM
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911
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mepstein
post May 29 2021, 01:16 PM
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QUOTE(gms @ May 29 2021, 02:26 PM) *

911

Thought so. Thanks
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gandalf_025
post May 29 2021, 01:28 PM
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This, from my car.... # 619

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914werke
post May 30 2021, 09:33 AM
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isnt the shatf hole on the intermediate plate?
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fixer34
post May 30 2021, 05:00 PM
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Took these today while I was pulling all the calipers to send in for a PMB rebuild.
March '70, 0836. Mine has a small V notch on the casting extension, not the circle.
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davep
post May 30 2021, 06:58 PM
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Thanks very much for those images of the trans #'s. That pulls the start of the reinforced case back much earlier. Interesting about the V-notch. That feature is not used on the 914/6, correct?
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fixer34
post May 30 2021, 07:07 PM
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QUOTE(davep @ May 30 2021, 07:58 PM) *

Thanks very much for those images of the trans #'s. That pulls the start of the reinforced case back much earlier. Interesting about the V-notch. That feature is not used on the 914/6, correct?

I don't believe there was anything ever attached there and I've had mine over 40yrs.
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