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seymann
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That is not unusual for a used 996 or 997 GT3 differential. The original pre-load on the disc plates is quite low on the street GT3 model cars. The disc plate copper or brass material wears faster than the steel found in GT3 Cup cars. The combined mass and rotational friction of the wheel/tire, brake disk, and drive shaft universal joint can be sufficient to keep the other wheel from rotating while you turn one by hand. Thanks.
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I always understood that with the car on a lift, if you turned one wheel the other would turn the same way with a limited slip diff. I tried this with my GT3 and found that the other wheel didn't turn at all (or just barely). Is this normal with the GT3 diff or is something amiss.