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Originally Posted by lawren
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Negative: Started to get a roaring noise in the turns (both directions) at the end of the first of the two-day weekend. Noise continued through second day. At first I suspected tire rub but quickly eliminated that. Suspected it was a wheel bearing but those checked out OK later by mechanic. Mechanic said he heard some noise in the gearbox/diff and changed the fluid (no debris). That certainly seemed to help with the noise (see below).
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If the noise occurred in both turning directions, it's unlikely to be a wheel bearing -- it usually makes noise when turning in the direction that puts weight on that wheel. One surprising thing that can cause a grinding/roaring noise when doing a hard turn is the engine mount (or possibly transmission mount). When it goes bad, it can cause the engine to move
just enough to allow something to rub heat shielding or other things, and it sounds horrible!
The other things I thought of when you described instability in the wet, with unwanted rear end movement under braking, are alignment and stiffness. If you have too much (relative) front end grip and toe out, the front will be very happy under braking and turn-in, but the rear will not. Unwanted rear toe out will also be problematic, causing the rear of the car to be unstable under braking. And in the wet you really have to soften the rear end relative to the front, so that the rear of the car is "compliant" and grippy--you might consider disconnecting one side of the rear sway bar so it is effectively removed from the car. This will keep the rear end more planted, which is vital in the wet.