TRD Short Shifter Rattle Noise, It's Normal?

[Dave W]

The flower knob is not nearly heavy enough to be effective. Tape weight to the shift lever or a roll of solder warped around the knob to see how much wt is needed to change the natural frequency. We are probably talking a large chrome shift knob to be able to add enough mass. Have you checked the transmission and engine mounts plus the attaching hardware. You can also try adding dense foam rubber inside the shifter boot.