Unless there is an aftermarket kit (which I can't find)...you will either have to deal w/ it or buy a new shifter. Mine is doing the same thing, but I'm not willing to fork out $275 for a new shifter yet.
'05 Blk Prem V6: Roush Styled, X-Charged, & Highly Modified - Sold
'06 Torch Red Prem GT:
Show: Shelby GT-GT/CS Front Bump, Shelby GT Grille, Shelby GT Lower Foglights, GT500 Chin Spoiler & Rear Spoiler, GT Hood Scoop, GT/CS Side Scoops, Shelby GT Fender Emblems, AM's Painted Mirrow Covers, Quater Window Louvers, & White Hash Marks; Sequential Tail Lighting.
Exhaust: Factory Headers, SLP (High Flow) Catted X, and SLP LoudMouth 1s.(Kinda loud haha)