i have a 91 tsi awd and i just flushed the whole tranny fluid and put in gm syncromesh friction modified but it still grinds second when i either shift fast or after like 15 miles of driving when it gets hot but i was wondering how much about would it be to get this fixed? or would i be better off buying a new tranny? if not does anyone know a good place to do a rebuild .............what do you guys suggest i do?