Celica Forums General Discussion General grinding gears

I tried this post once but didn't recieve reply so i shall try again i have been having trouble downshifting in my 6 speed manual celica, it grinds when i down shift so i tred the doubleclutching that one of the celica members had metioned and it works great but what does that mean if i can down shift but if i rev up a little and then down shift it works perfectly some one please reply with some help

i have a gt, but i believe its because of the syncs and that it doesnt want you to drop a gear at a too low rpm, ie match the rmp with what it should be for the gear and the speed and it should do it fine