Roar in 6th Gear???
 

Hi Guys. When my car gets to the "sweet spot" in 6th gear and going at least 40mph, I get a roar from the transmission. If I push down or up on the accelerator, the roar goes away. In a stick, it would sound like a throw-out bearing, but not as meaty sounding.
V-6, Automatic 2LT, RS. I drove (and kept over a weekend) another v6 except it was a different color. The salesguy says they all do it?? Both the cars I drove did it.

Any ideas??????
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