05+ Steeda Triax Shifter problems?

[07GT]

I recently had the 05+ steeda triax shifter installed on my 07 GT. Since then my car resonates/vibrates...gets worse as RPMs go up. I called Steeda who said that shouldn't be happening. I called install shop who said doesn't sound like vibrating driveshaft because is worse with increasing RPMs not increasing speed/MPH. I am hoping someone with more knowledge than I possess can shed some light on this problem or has experienced this problem and can give me a fix. Thanks

[SpectorV]

Steedas are known to make noise through the drive train but... the 05s are not the same as in they dont sit right on the transmissin. I would try to put some sound deadening around it or some sort of gasket (if they make it) on the shifter to absorb some of the resonance (noise that travels up the metal from the car)

[Herbstang]

greater whine /vibration is normal I mean think about it, your bolting a virtually no rubber, all metal piece directly to the transmissionso the handle is acting like a tuning fork
Did the installer put the factory inner dust boot back on ?? instruction may says not to but it cuts out some whine/vibration

[SpectorV]

you may can get a gasket and mount it before the shifter mounts to the car and it might help remove some of the sound~

[fear1]

Since the shifter mounts to the floor and not a top-loader, I would guess you have a piece of linkage or something against the floor of the car causeing the problem.