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Finally cured a creak/groan my car had in the rear at low speeds. This was my second time under the car checking bushings. Then, I decided to check all the bolts on the rear axle bracing.
Bingo! The two forward passenger side bolts on brace were missing. But, I was wrong, they were still there. They had twisted and snapped the heads off. 600+ whp and wtq will break things I guess.
I got the broken stumps out and replaced all four of the forward bolts with grade 9 instead of the factory grade 8 bolts.
Noise is gone for $8 dollars and less than an hour of my time.
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