My 2004 LL Bean occasionally has a shake or rattle it at highway speeds. It acts almost as though it's on grooved pavement (even on a totally smooth road). It will also shake when shifting. It doesn't do this all the time. Just wondering if anyone else out there has experienced this. The car has 25K miles on it. I've noticed this over the last few months.

Thanks

This doesn't sound good to me. There may be a problem with the transmission bearings, CV joints, or rear end. I would get this into the shop. Hopefully the warranty will cover this.