new short throw grinding???

On my 95 gt it has grinded when i put it in 1st gear if i was going over 10 mph since i bought it now one year later i have bought the new pro ripper shifter form B&M when i shift fast there is grinding in almost all of my gears and when i shift slow there is no problem. what do u guys think about this? with the stock shifter it would sometimes grind in third also I KNOW IT ISN'T BAD SHIFTING!!! What yould you guys do and what kinda $ am i looking at hear. haha

thanks

already tried that anything else?