The crankshaft threads are pretty hard, maybe try getting a longer balancer bolt (no washer), and threading it in all the way (using all the threads) and trying that.
The 2022 Mustang GT Premium California Special specs show it comes with a Torsen Rear-End:
2022 Ford Mustang GT California Special (topspeed.com)
This is pretty much normal behavior for the Torsen, as mine also does this exact same thing occasionally.
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Looks like pretty heavy wear on that pinion bearing, What does the Cup/Race look like ?
Interesting color on the gear marking compound, What is That ? , but pattern looks OK
Agree,
I believe some of the bolt replacement is because of Legal.
I worked in the Ford garage back in the 70’s & 80’s. Very few suspension bolt replacements were called for in the Ford repair manual. After a few law suits and now bolt replacements everywhere.
The Flanges are interchangeable to the pinion shaft. Its only the driveshaft mounting that is different.
Either way you prefer would work. Both ways, you need to be careful not to crush the collapsible spacer any more & end-up with too much preload on the pinion bearings.
The 2017 Mustang (With Manual Trans) took a different Flange than the 2018->Up Models.
Measuring inside the Flange
2017 Manual Trans = 112mm
All 2018->Up = 110mm
That gear pattern does not look good at all.
Drive-Side way to low (towards the toe of the gear)
Coast side is way too high (towards the top/crown of the gear.
No way that would not make noise.
When you are rolling pattern, hold pinion with your hand or a rag wrapped around pinion to give some...