Transmission number mystery.

[ajwans]

I'm looking for some help identifying my transmission as being
correct to my car or not. The stamped serial number is 7191377,
I did not yet locate the type number under all the grime.

The issue I have is that the options list includes LSD. I have a feeling
either the differential or the entire transmission has been changed
out because the half shafts are LOBRO instead of the Nadella which
should be installed for LSD.

I spoke to Porsche and the bloke there says that the engine serial
number (from the build sheet) should be 2xx.xx, seems a bit off to me
from the other serial numbers I've seen so far but can anyone confirm
what the serial number from a LSD transmission looks like? Maybe
he's reading the wrong number, it's in German after all.

All help appreciated.
andy

[lisa_spyder]

Hi Andy,

The number you have given is for a standard ratio 5 speed for model year 1969. The type should be 901/07 (when you manage to scrub off the grime ).

Happy to look at the other numbers you have been given if you feel comfortable sending a pm.

Cheers,

Lisa

[ajwans]

Thanks Lisa, I actually wasn't masking the number 2xx.xx, all
that Porsche could give me was the first number. Understandably
they are concerned that if they give the correct numbers then
fake stampings of the correct numbers could be made.

Any idea what the number 2xx.xx from the build sheet refers to?
I've looked all over the boards and never seen a transmission
number in that format.

andy

[lisa_spyder]

Andy,

Using your chassis number (with no "s" stamped), the guys at Porsche may make the assumption that the car is a 911, not an S and most likely have assumed a 902/1 TM which has a number range 220 001 - 221 721. I don't believe there are 5 digit TM numbers. However, if they were to assume your car is an S produced in the '67 model year then it should have a 901/02 box if standard, number range 103 001 - 105 191. Both boxes are 5 speed, but the 902/1 has a shorter 5th (all other ratios are the same). It may be that the guys at Porsche are right -your car could have been ordered with a specific TM which contained a shorter 5th...or it could have been ordered with any ratio requested.

Clear as mud isn't it ....

[ajwans]

Well, things are becoming clearer. I think you're right, my car was ordered
with the shorter 5th gear and got a 902/01 box. Must have been replaced
sometime with this later transmission without LSD.

Guess now I should start searching for a 902/01 or 901/02 to make it more
original.

I figured something was up when I spun one wheel and the other wheel
spun backwards.

Thanks for your help Lisa.

andy

[lisa_spyder]

Andy,

I'm doing some lateral thinking for you...sending you a pm .

Cheers,

Lisa

[ajwans]

I have spoken with Porsche again and the very helpful chap there
has confirmed that the number against the engine is 2xx.xx
(that's no typo, just 5 numbers separated with a period) and
that there is no other serial number against the transmission.

He was able to get a translation from Germany as his german is
pretty basic and it lists "Airport gears" against the transmission.

Now, the money question, what should the serial number for a
67S gearbox with airport gears look like?

andy

[lisa_spyder]

OK - well I would l think that the transmission type should be 901/52. Trouble is that I can't readily find all the papers we have with a list of TM numbers recorded against types . The spec books are no good for pre '68 for this type of info, as the TM serial numbers are not listed except for the most "common".

I think we have some info recorded; but since we've moved everything I have to find where we've put it....


C'mon guys - I know a few of you are lucky enough to have this combo in your cars...can anyone crawl under and read a TM number for Andy?