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Rear axle nut was loose - is my rear bearing thrashed?


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So I went to do a rear wheel bearing R&R due to looseness in the wheel and intermittent noise under load. When I put the breaker on the axle nut, the thing just turned! It's supposed to be torqued to 340 ft-lbs!

I tightened it to spec and the looseness has disappeared, and I haven't been able to replicate the noise (it occurred mostly under engine braking).

Question is this: after a couple thousand miles of driving w/ intermittent mystery noise that looks to have been due to loose axle nut, is it likely that the bearing was damaged and that I ought to do the replacement anyway? I rented a tool to do it and would hate to have to jump through that hoop again, but the procedure does not look like much fun either.

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I didn't have a torque wrench that goes to 340 ft-lbs, so I had to do the "step on extension 2 ft away from pivot with my 165 lbs" method of torque. We couldn't break the other side loose even by stepping on the breaker, so assumed it was torqued properly.

I bought the car from a non-porsche dealer (got a great deal) that had replaced one wheel bearing after taking it in as a trade. I had someone else pick it up while I was out of town and he did not note which side had been done. My theory is that the loose nut was do to improper torquing after the previous R&R service - they probably just tightened it the same way you'd do on a normal car, which would be typically be less than 150 ft-lbs.

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