Early Gearbox Help

[mrar]

Good detective work,great find!
Makes it all worth while.

[Fishcop]

Good to hear John - proof nice guys do win sometimes!

Thanks Dirk. I think that's the first time I've been referred to as a nice guy . You need to come out on the turps with me one night

[davep]

Well, CONGRATULATIONS. Since they are both aluminum cases, there will be date codes on the side of the main case near the diff cover. There are also casting part #'s there, the last digits give the revision. Please look for any other markings that may indicate the LSD was original; some people report a stamped "Z". Photos would be most useful. Knowing the actual gears would be interesting to see if the boxes have been updated. 904 mainshaft would be a bonus. You may be stuck with the Nadella shafts unless there is something special to adapt the ZF LSD to use CV joints available.

[Jon B]

Jon B's tip proved correct... (Jon just doesn't know his Nadellas )

I opened up this gearbox and viola... another LSD! Physically it looked the same as the first. This one had some interesting numbers on the differential itself I hope someone can decipher for me... 4061004004-436856.

See number on bottom, below...



Jon B.
Vista, CA

[Jon B]

John,

These are both 911 transmissions by serial number, but the one pictured on a stand has a 912 front mount.

[Fishcop]

Thanks Dave and Jon, your assistance has been invaluable.

Both boxes are very dirty and need a good scrub; which is a job for next weekend. But I will dust off my good camera and take photos of everything, as well as trying to find any relevant numbers/stamps.

I thought the gearbox cross member from the S was odd - I thought it may have been a "targa thing"

So far, so good. My knee-jerk purchases have uncovered a real S Targa, a real S engine (not correct for the targa though), some proper RS flares, a very straight rust free L coupe, and two useful gearboxes... Now I just need to put the money I pinched out of my kid's school fund back and promise my wife "not to do it again", and I'll be good

[Jon B]

This one had some interesting numbers on the differential itself I hope someone can decipher for me... 4061004004-436856.

More information on your ZF...

The numbers 004 004 indicate a version without "wavy" preload clutch discs. This version may react like a standard differential when one flange is turned by hand, as I mentioned earlier.



Jon B.
Vista, CA

[Fishcop]

Brilliant stuff Jon B! That's exactly how it is... I wonder what the advantage/disadvantage to having no pre-load is?

Thanks again.

[Jon B]

Diffs without preload don't wear down their clutches as quickly, and allow cars to turn more easily at low speeds. For long-term street use these are important factors.

Jon B.
Vista, CA

[WP935]

Can anyone tell me what this is ?

902-16 #5191720

Thanks,

Woody