My 05 does this also back sometime ago there was some postings on here about changing the rear end pumpkin oil because it was the wrong oil and putting the correct in it just so happened that my was going in for PA inspection so I had them change the oil and it did stop for awhile but noticed it still doing on very sharp turning! Seams if your going very slow it not very noticeable! Question for Mike when the rear axle nuts are tightened the 1.5 turns did that fix the hoping on your car?
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While in Hershey Pa, Bruce "cadillac tech" told me to have the axle nuts checked on our next service because they can work loose. We were fortunate that we never experienced the binding/pushing but when I asked my dealer to check them he responded "are you having the binding/pushing feel when you turn sharp at slow speeds". Again, we never experienced that but they did tightened the axle nuts 1.5 turns and so far we still haven't had a problem. Based on Bruce telling me to have the axle nuts checked and my dealer knowing of the issue, it is a simple check to have done.