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What is the official designation for a 915 tranny

What is the official 915 tranny designation?

Something like what would be used as the supplier description. Is it ZF 915 is it the actual P/N 915.300.010.61 or ??????

TIA

Terry
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79 SC Minerva Blue ROW
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3.0 SSIs, Backdated Heat
COA: Passenger Side Mirror, Manual Antenna & Dunlop Tires
Old 08-29-2017, 08:59 AM
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gearhead
 
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There are dozens of 915 complete gearbox part numbers, each one pertaining to a particular year(s) and spec. ZF had nothing to do with it. It was a Porsche proprietary gearbox manufactured with assistance from Getrag, Hurth and Hoer, depending on year.

Can you flesh out what you want to know and why? That would help me give you a more detailed answer.
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Old 08-29-2017, 10:06 AM
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Hi Matt, thanks for the reply.

I have a blank disc on a shift know I was going to get laser engraved. Not sure of what I am going with. Her is the link to my original post:

Suggestion for shift knob engraving design

I was thinking tongue in cheek as a tribute to our finicky gear boxes as an option.

Achtung!
915

or

Achtung!
915.300.010.61

Of course only the 911 crowd would fully understand this, who else would ever drive my car.

Terry

In my 79 SC it should be P/N 915.300.010.61
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Old 08-29-2017, 10:29 AM
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gearhead
 
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Maybe the type number to make it shorter and use a larger font? 915/61

You could even split it and put the manufacturing logo used on the prodate
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Old 08-29-2017, 11:07 AM
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915

Here are the specs and types for 5 speeds:


915 TRANSAXLE SPECIFICATIONS-GBOX Transmission
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Old 08-29-2017, 11:14 AM
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I like that idea Matt, any idea where I can get a clear image of that logo?

72911, thanks for that link, although it won't help me with my polished knob , that was an epic road trip thanks for sharing.

Terry
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Old 08-29-2017, 11:23 AM
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Terry,

Here, I dug a little more...


So the Getrag logo is a G with an H pattern for shifting on the tail of the G.

Or you could go with the Hurth script on the other one. By the time your gearbox was made almost all manufacturing was being done by Hurth.
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Old 08-29-2017, 11:40 AM
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Thanks again Matt, you help so many of us here, be it technical or less than technical.

I think I might go the Hurth.

Its like folks who get tatoos, permanent statements that sometimes trivia for the few to recognize, personal or just for the conservation

This is as close to a tat my car will get. a trivia statement that we few will get.

I've been away helping the mother in law out and the boredom is setting in can ya'll tell?

I'm leaning more towards the 915 warning as it is the direct input and cabin connection to the unseen demon.

Terry
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Old 08-29-2017, 11:51 AM
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You're quite welcome. I kind of like the Hurth idea too. I was thinking about how all the old muscle cars got a Hurst shifter. Instead you get a Hurth one...
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Old 08-29-2017, 12:00 PM
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Quote:
Originally Posted by Matt Monson View Post
You're quite welcome. I kind of like the Hurth idea too. I was thinking about how all the old muscle cars got a Hurst shifter. Instead you get a Hurth one...
Your really selling me on this one with that.

This is going on the top of the list.

Got to see if the wife has her software to grab the logo and clean it up. We are just here for another month and need to hook up with a good friends buddy who has the laser engraver.

Thanks again

Terry
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Old 08-29-2017, 12:14 PM
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Quote:
Originally Posted by Matt Monson View Post
Here, I dug a little more...

So the Getrag logo is a G with an H pattern for shifting on the tail of the G.
Or you could go with the Hurth script on the other one. By the time your gearbox was made almost all manufacturing was being done by Hurth.
Quote:
Originally Posted by BlueWing View Post
Thanks again Matt, you help so many of us here, be it technical or less than technical.
Quote:
Originally Posted by Matt Monson View Post
You're quite welcome...
Always nice to see my old photos and information re-posted ;-)

Quote:
Originally Posted by Matt Monson View Post
By the time your gearbox was made almost all manufacturing was done by Hurth.
Matt, I'd say that gear production in the 915 era was roughly 60% Getrag, 40% Hurth.
The 915 housings were done by Honsel or Mahle, synchromesh by Goetze, Limited-Slip Differentials by ZF, etc... Many manufacturers were involved in those days.
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Old 11-09-2017, 01:58 AM
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Quote:
Originally Posted by Jon B View Post
Always nice to see my old photos and information re-posted ;-)



Matt, I'd say that gear production in the 915 era was roughly 60% Getrag, 40% Hurth.
The 915 housings were done by Honsel or Mahle, synchromesh by Goetze, Limited-Slip Differentials by ZF, etc... Many manufacturers were involved in those days.
Correct me if Iím wrong but that split varied by years with early 915 gears being Getrag and later stuff being Hurth. Thatís why I stated by the time his box was made.

Ainít google grand? Found that photo already uploaded to pelican that way. I couldnít find a single gear I had here that had that clean of a Getrag logo.
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Old 11-09-2017, 05:50 AM
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If the project is not complete, my vote goes to:

CAUTION! 915 BACK THERE!
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Old 11-09-2017, 09:12 AM
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Have not gone too far on it. I need the wife to fire up her graphics shop again. All her software is at another location right now as we build up a new building.

She needs to clean up some of the lettering and than my next trip to visit a friend in N.C. I'll bring the know down with me for laser etching.

Here is what it will be on the 1.250 aluminum center:

Achtung!
ZF/Hurth
Schaltgetriebe
915.300.010.61

Done in the correct colors and fonts.

I'll post some pics of the finished knob when done.

Terry
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Old 11-09-2017, 10:02 AM
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Quote:
Originally Posted by Matt Monson View Post
Correct me if Iím wrong but that split varied by years with early 915 gears being Getrag and later stuff being Hurth. Thatís why I stated by the time his box was made.
Matt, in my experience the gear production split always favored Getrag.
Getrag had a strong relationship with Porsche for decades, since collaborating on their first synchromesh transmission. They were just up the road in Ludwigsburg.

Here's a page from the 85 Service Information manual.
For an illustration of the manufacturing code on 85 ring and pinion gears, they show the Getrag trademark.

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Old 11-09-2017, 11:45 AM
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Cool. I’ve considered backdating my 74 dash to metal and having “pause when agitated “ scribed on it.
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Old 11-09-2017, 11:47 AM
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Quote:
Originally Posted by Jon B View Post
Matt, in my experience the gear production split always favored Getrag.
Getrag had a strong relationship with Porsche for decades, since collaborating on their first synchromesh transmission. They were just up the road in Ludwigsburg.

Here's a page from the 85 Service Information manual.
For an illustration of the manufacturing code on 85 ring and pinion gears, they show the Getrag trademark.

I donít know if Iíve ever seen a Hurth ring and pinion set. I was talking about the gears themselves. All those high toothcount 3.2 ratios Iíve seen seem to be Hurth.
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Old 11-09-2017, 11:48 AM
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Quote:
Originally Posted by Matt Monson View Post
I donít know if Iíve ever seen a Hurth ring and pinion set. I was talking about the gears themselves. All those high toothcount 3.2 ratios Iíve seen seem to be Hurth.
Matt, I don't have any nearby to photograph, but there are currently three 915 5th gear sets on eBay, two of which are Getrag 3.2 ratios.
I'm not sure if Pelican blocks links to eBay, but if so just search "Porsche 915 gear 5th"...
A Getrag 38:30 gear set dated 12/83... https://www.ebay.com/itm/371776644513
A Getrag 38:29 gear set dated 4/84... https://www.ebay.com/itm/263267705862

Hurth also manufactured ring & pinion sets for Porsche in the 356 and early 911 days, but perhaps not so much by the 70s/80s.
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Old 11-09-2017, 12:59 PM
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I have no data, just observation over time. And yes, I’ve seen plenty of 901 Hurth CWP sets. Just not 915.
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Old 11-10-2017, 08:04 AM
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