Vibration in 3rd gear @ 3100 rpms
 

Hey Guys, I recentlyhad my throw-out bearing and clutch replaced by a Ford SVT certified service tech (my '01 Cobra has 30,000 miles). I notice now that I have a strange vibration only in 3rd gear and only @ around 3100 rpms. Any ideas what this could be so that I might be able to guide the tech in the right directions? Thanks in advance.
-Vin

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RE: Vibration in 3rd gear @ 3100 rpms
 

not enough info given......

RE: Vibration in 3rd gear @ 3100 rpms
 

Does the vibration continue past 3100 in 3rd? Is it driveline problem vs loose exhaust? A better description could help narrow it down. Could be unbalanced wheel or crank not balanced. 2 total extremes so...a little info needed