Thank you for the reply, The CVT transaxles have had some noise issues, Ford has come out with a Service Bulletin for the noises, From your description it sounds like a bearing noise, look at possible cause #1 on the service bulletin, if it is the transaxle will have to come out of the car to be repaired, the bulletin states that the repairs are covered under the new vehicle limited warrenty coverage, hope this helps.
Some 2005-2006 Freestyle/Five Hundred/Montego vehicles equipped with a continuously variable transaxle (CVT) may exhibit noise under various driving conditions.
Use the following Service Procedure to identify and repair specific CVT transmission noises.
It is important to understand normal operating characteristics of the CVT, what type, location, and speeds of noise.
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage