...there is a noise I hear when stopped - in gear - foot on the brake. I don't know how to describe it but a slight grinding sound??? Is this just the tighter converter or should I be worried?

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2006 Jeep Liberty Limited CRD (purchased 10/30/12 w/ 52k miles) GDE HotTune & Eco TCU, Suncoast TC, Amsoil Full SAPS (EFM) 5w40, Amsoil ATF, 7" touchscreen Android powered stereo (direct from China) w/ 4G LTE mobile data for streaming Netflix, HBO GO, Slingbox, Pandora, etc.