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Posted by: mate914 Jan 15 2021, 07:43 AM

I am about to endeavor a few transmission rebuilts. As I was collecting my specimens I noticed one was different. Can someone please shed some light on this transmission. It is a side shift right now. Photo lower right shows flange on bell housing.

Posted by: rgalla9146 Jan 15 2021, 08:26 AM

A trans with a 911 prefix is for a '70-'71 911.
Next came the 915
The '911' trans was the first to incorporate a 'pull' type pressure plate.
It has cast in features that the clutch tube and cable are guided by/attached to.
The one on the right (upside down) appears to be a 911 type.....that flange secures the end of the clutch cable.
What rear cover is on that trans ?
If it has a 914 rear cover it was probably mated to a later engine to use the pull type clutch.
Don't forget this involves flipping the ring and pinion and FULL re-set of all tolerances.

Posted by: 914Sixer Jan 15 2021, 10:57 AM

If the side shift conversion has been done, maybe the ring and pinion have been flipped.

Posted by: rgalla9146 Jan 15 2021, 11:24 AM

Mark is right, looks to be set up for side shift so probably flipped.
Finger crossed for correct set up.

Posted by: mate914 Jan 15 2021, 11:34 AM

It came with a parts car many years ago. It was Attached to a 2.0 /4 .
Tail is # 914.301.302.00
Matt

Posted by: mate914 Jan 15 2021, 11:38 AM

The car that it was in looked like it had been driven for many years. The car just suffered from East Coast cancer a.k.a. rust.

Posted by: oldie914 Jan 15 2021, 12:38 PM

Looks like this case is a 1970/71 911 surplus casting that was used for a 914 transmission. I've seen a couple like this. The castings were machined with the vent in the 914 position and did not have the steel reinforcing plates inside the differential carrier housing needed for the pull clutch on the 911. Throwout bearing arm pivot location was also drilled in the right place for the 914.

Posted by: davep Jan 15 2021, 04:36 PM

It would be very useful for me to know the serial #'s of all the transmissions you have. The odd case is certainly a 70/71 version, and of the later variant since it has the side pad for the serial # off of the central rib. This case was also used for the 914/6. Now the question is was it originally for a 911 or for a 914/6; the answer lies with the vent location and if both locations were drilled & tapped.

Posted by: rgalla9146 Jan 15 2021, 07:37 PM

No guide loop on diff cover casting....as seen on '70-'71 911

Posted by: oldie914 Jan 16 2021, 04:12 AM

The throwout bearing arm pivot for the pull clutch on a 1970/71 911 transmission was in a different location than for the push clutch. Attached are pictures of a 1970 case converted for use in a 1969 911 including details of the reinforcing plate for the pull clutch pivot.
Also pictures of the bottom of the case showing the pad for the serial number was not
included on the early cases.

Posted by: mate914 Jan 16 2021, 10:27 AM

Here are more pics....

Posted by: mate914 Jan 16 2021, 10:28 AM

I cleaned it all up. I could not find any numbers on the transmission. I will know more when I pull it apart.

Posted by: mate914 Jan 16 2021, 01:47 PM

Posted by: gms Jan 19 2021, 09:59 PM

This is an unstamped case used for 911s and 914/6s
the type and serial number would be stamped on the flat area