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Hello everyone.
My wife sat in the back of my 712 M
and told me that there was a noise from a bearing or pinion
in the rearmost axle
that I couldn't hear from the driver's seat

she took the wheel and I sat in the back seat
and noticed a noise when loading between 5 and 30km/h

the axle oil levels are OK
all 6 tires are new

I tested it on a friend's car, where the noise is also more moderate.

Is it the differential that loads?

Have you noticed this phenomenon on your 712s?

thank you for your feedback
Eric

Translated with DeepL.com (free version)

If it's only under load, e.g. going up a grade, it's a difficult problem to isolate.

Going under the premise that: noise = wear = Hot. You might want to try an
Infrared Thermometer pointing at BOTH diff's to see if there's a significant
difference -- as well as each of the four rear portals. You might also want
to raise each wheel off the ground and give each: close-wise/counter-clock-wise
movement to see if there's any distinguishable "play".

good idea
I'll give it a try.

thanks
Eric