Ultimate 69S factory Sports purpose thread

[HughH]

901/07 is a production 5 speed in a die cast housing serial # starting 7190xxx 7:31 final drive gears 1st 11:34 2nd 18:34 3rd 22:29 4th 25:26 5th 29:23
901.10 (69S) had either a 901/07 or a 901/13 (sporto) as standard engines

[beh911]

The transmissions in the previously posted competition T's are incredibly rare.
901/79
One minor correction to Hugh's post:
901/13 were same ratios at the 901/07, but differed in housing. Porsche switched to full magnesium midway through MY69 production.
(There were no sporto 69S production cars)

[HughH]

you are correct bryce

I cant read across a table properly :-( (too tired when i looked at it and I looked at 905/13)

[rower]

I’m looking at the gts 0009 kardex that lists gearbox number 928 4107, with Neurburgring ratios and written above it is 901/74. For 008 and 003 the transmission type is merely no 25 and no 27.


What’s a 901/74 from that chart?

Hugh - where do you see this on the kardex?
“ With the Vard car that accounts for 4 of the 8 901/79 AL Nurburgring gear boxes made in 1969”



Of course since this is a factory werks car, there are no options listed as the kardex was done after the fact when they went to sell it to a privateer.

Though this thread discusses the 901/74. Case made of aluminum.

http://www.early911sregistry.org/for...g-to-find-info

[HughH]

901/74 is a 1968 magnesium Nurburgring ratio gearbox and it is surprising to a certain extent to see a 1968 serial number part such as this in a 1969 vin car from new - although given the circumstances maybe not so surprising

Mostly the gearbox type number is NOT listed on the kardex for these special ones. It is unusual for that GTS one to be there although I still cant figure out what the references on the other two mean. If I knew how many Mg Nurburgring gearboxes were made in 1968 I could possibly guess that the two numbers for each represented the last two numbers in the serial number given all the others were predetermined by the gearbox type number - ie 928 4127 and 928 4125

I have a list of special / sondergetribe gearboxes by type (both the ratios and material used to make them, Al/Mg) and the corresponding serial numbers for them. As each has a specific number in them (differing for year to year as well) I can tell from the number what the type number is which in turn identifies the ratio and material the gearbox is made from and in some cases from the spec book how many were made. Some of them - in particular the 1968, 1969 and 1970 ones but only the AL version (mostly) not the Mg version or which was which - can be found in the little spec book.

Between a few people on this board (including Jon B and Davep and the work on that other thread) we worked out that there was another identifying number in the serial number - the fifth in the 1968 928 series (and the 1969 739 series) which was either a 0 for Al or a 1 for Mg - so the one you posted was Mg. However I am still confused about that other 901/74 gearbox 9284109 claiming to be Al when all the other gearboxes with the extra 1 in them seem to be Mg and the ones with a 0 seem to be Al.

This is the list of 68 type numbers and the first series can be found on page 12 of that years spec book (and pp62 and 63)
901/50 92800xx
901/51 92810xx
901/52 92820xx

901/53 92830xx
901/54 92840xx

901/70 92801xx
901/71 92811xx
901/72 92821xx
901/73 92831xx
901/74 92841xx



The equivalent 1969 year ones are on the table Bryce posted above
901/75 to 901/79 (plus the ratio to order 73990xx ones) for the AL versions and the
901/80 to 901/84 (plus the ratio to order 73991xx ones) for the Mg versions
The 1969 version of the spec book shows how many were in the series (hence I can say that I now have 4 of the 8 73940xx ones but the 1968 version does not give this information - just going to 928x999

[rower]

Is there anything special about the transmission itself except for the internal gearing? On Ferrari racing cars they were ribbed versus unribbed but anything special here?

[HughH]

I dont think so - later on there was a difference between shaved and ground gears (and transmission with built in oil pump) but not in the 60's I don't think.
Jon B would be a good authority on this though - not me

[sanders]

Well "F" me. There is a good reason to understand what your Kardex is telling you. I bought 00004 20 yrs ago and decided before I got the Kardex that the tranny was some replacement with little value. I've been vintage racing with that box in another car for over a decade. Mag case, 904 main shaft, ZF LSD, you know nothing special. This thread turned on the light. When I got the Kardex in '03 I never really paid attention to the hand written notation below the gear box number. There are also some contemporaneous notations made by Jurgen Barth all outside the actual Kardex explaining what different things mean so I just overlooked what I now believe says replacement gearbox 46. So I looked at the race car and what did I see but "46"! Time to swap boxes again, good news is the same customer own both cars.Scan_0009.pdf

Bryce, I'm going to need you to fix my attachments again, thanks.

[rower]

Once again Hugh comes through for you Roy!

[beh911]

...When I got the Kardex in '03 I never really paid attention to the hand written notation below the gear box number. There are also some contemporaneous notations made by Jurgen Barth all outside the actual Kardex explaining what different things mean so I just overlooked what I now believe says replacement gearbox 46. So I looked at the race car and what did I see but "46"! ...

Wow! Pleased that you shared this with the forum.

Thank you, sanders!



"46"