Welcome to the site. Check out the 4.6 tech sections for some help.
I installed an aftermarket Hurst shifter about a year ago with no problems untill now. I have removed the shifter and tried to disengage reverse manually using a screw driver and wrench, with and without the clutch engaged or the car running.Hey Steve welcome to AFM! Is it an aftermarket shifter or a stock unit? Give us some more info and maybe we can help. I'm also going to move this to the 4.6 Tech section and see if we can get you some more answers.