UPDATE: Got a call finally today from Serra (I was waiting for them) & the service writer said their mechanic took the car for a test drive & listened to the 3.6L - he thought the motor is fine. (I hear rocker noise for at least 10 minutes when it is cold - sounds like a BOSS 302 valvetrain!). Then he said the tech checked out the trans, the fluid, & pressures - he felt all was fine with that too. BUT, he said the tech found the driveshaft "coupler" was almost total failure & it was covered under the drivetrain warranty, so they are going to fix that. I asked the service guy if it was a U-joint, or if the driveshaft was a 2-piece - he really didn't know anything about it. Anyway, I'll pick the car up on Sat. - heading out-of-town for business tomorrow-Fri. Now I gotta check into this driveshaft assembly & see what failed & why, & keep an eye out for this in the future.