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I've not had that happen to me in any 915 transmission, nor in any other Porsche transmission.
The 66.63 on the original r&p was the ideal pinion face offset from the diff's rotational axis, as I think you surmised. Getrag/Porsche shifted to providing that value later in the 915 lifetime. I have a '85 Euro 915 box on the bench with this absolute marking rather than the N deviation.
Are you confident that your VW 289 is reading correctly? I'd offer to compare it to my VW 385 set measurements, but you're a bit distant and shipping may be expensive.
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Kevin
Catellus Engineering
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