I also have asked and searched for opinions on what this is... When i go into third gear about 7 out of 10 times it grinds, and it pops out of 2nd and reverse sometimes I have no idea what it is... Some have told me that when it slips out it could be shifter forks, and when it grinds, it could be the throw out bearing.. I dont know!!

98 CSVT #135 of 6535 (black/Blue) --Custom Grille, Calipers(red), Taillights On the Way---Brembo Rotors and Spec Stage 1