mdcobra98

I just had my friend test drive my 98 cobra. My transmission makes a lot of noise. It whines and rattles a bit. I put royal purple synchromax in it but no change. My friend told me my tranny is fine but the back stoppers in my new steeda shifter need to be moved back a little in 2nd and4th gear, because the metal is vibrating against the metal back stoppers. How do Imove the back stoppers a little back?