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Fifty driver,
I had the same issue as you. PM me your number and I will call you to discuss. Your problem is the Posi upgrade. Pull it and your car will no longer make that noise.
I purchased AAM 3.70s, BMR bushings, JRE's posi upgrade, and billet end caps. Now let me start, by saying that I am not bashing any vendor or product. I am currently at 650+ rwhp and was told that the posimod would help traction. This is my daily driver in the summer. I repeatedly asked whether this would affect daily drivability. I was told it would not. I now know that the wheel chirping is considered normal.
I also had the loud clunking and a sound like a spring releasing whenever I did a tight right turn or a descending turn. I could also feel the rear end fish tail somewhat. In my case, my launches sucked afterward. I would get a horrible shaking and a lot of noise on launch. The rear end felt like it was going to come off.
I too swapped the fluid multiple times and added the posi additive. I did more figure 8's than I care to admit. It did not help at all.
I had a local shop pull the differential and put the clutch assembly back to stock. Problem went away and no further issues since. This mod completely ate up my rear tires. So in the end I paid double the labor and had to replace my rear tires. It is the only mod that I regret making. But, you live and you learn.
Now, I am sure that for the drag racers on here, the chirping is no big deal. I couldn't live with it. I would not recommend it to someone who wants to maintain stock like driving manners.
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