Use some sound deadening material to layer over the opening under the floor liner or rug.
Then wrap the top of the housing and on the shifter with foam, some the thin flexible packing foam.
Use as much as you like to fill the shift boot but not too much to deform it.
Seems to cut down a lot of the noise.
Last edited by Scrambler82; 09-25-2013 at 11:30 AM.