[Grady Clay]

David,

Which ’69 901 5-speed do you have? The 901/07 is the typical aluminum case transmission and the 901/13 is the typical mag case version. What is your transmission number?

Porsche had all this stuff in flux in this period and didn’t document it very well (meaning hardly at all). Part of my current mission is to get all this info posted on Pelican.

Yes, there were quite a number of threaded pieces – some fit the armature, some can be machined to fit and some won’t work.

I’m interested about your question about different transmission axle flange lengths. For a given transmission Type, I think the only difference is between an open differential and a ZF LSD.

Yes, I recall some situations where we had to change the spider gears. I think this was the situation where the later threaded piece didn’t fit the spider AND the armature. This may be the situation where the (never delivered in a car) update part comes in.

Best,
Grady