901 Transmission Parts

[Racer Ralph]

I'm looking for some help in determining the value of some OEM 901 transmission parts. I have a 904 mainshaft and a 901 limited slip. Both are used but are in good condition. What are they worth?

Thanks,
Ralph

[Jon B]

Ralph,

Both items are valuable, depending on condition, but values are limited by current alternatives.

Porsche had 904 mainshafts remade in Germany several years ago, might check with them and base price off retail. Porsche number 904.302.101.00. Repros have also been made.

Guard Transmission offers high-quality 901 LSD, designed for use with CV flange. Original ZF differential was based on Nadella flange, so more desirable to someone running Nadellas. I don't know which ZF you actually have.

Neither item is seen in car, so condition & function probably more important than originality. Your original pieces should still be valuable, but can't put numbers on that without inspecting them.

Jon B.
Vista, CA

[Racer Ralph]

Jon B.,
Thanks for the info. I'll check with Porsche re current 904 mainshaft price. The ZF LSD is for Nadella flanges--I doubt if anyone is using them any longer. However, I remember someone making adapter stubs for the CV axles. That was some time ago so they may no longer be available.

Thanks again,
Ralph
Vancouver, WA

[66S]

there were some Lobro small cv flange ZF equipped transaxles in late 68 and some large cv flange ZF equipped transaxles in early 69. As far as I know the ZF unit is the same 904 type.

[ajwans]

I sent a message through this board a few days back. I would be interested to purchase the LSD when it becomes available.

andy

[Jon B]

there were some Lobro small cv flange ZF equipped transaxles in late 68 and some large cv flange ZF equipped transaxles in early 69. As far as I know the ZF unit is the same 904 type.

Yes, same ZF diff was used in all aluminum-cased 901 transmissions through early '69. It has a 904 number, and was used in 904, 906, 907 and 910 racecars as well. It will only accept unique female flanges, and most of those were Nadella. Finding rarer CV flanges is difficult, and an additional expense. CV flanges can be made by chopping standard '68 versions and broaching/EDM/jetting splines into them, or chopping up flanges and welding desired pieces together.

If Ralph's ZF includes Nadella flanges and you're keeping an early car original with Nadella axles, then it's a direct fit for such a car.

Jon B.
Vista, CA