I searhed for info on the GST TB but couldnt find anything...is the TB from a 2g gst the same as the TB from a 2g GS?? tia

no its not the same, you can use one from an rs,gs or dodge avenger or sebring (not the jbody) or you could use the jeep TB (60mm) with a little modification

1998 dodge avenger 4 cyl AT
Mods are:
Not enough