the problem is every time I down shift into 2nd and 3rd it grinds but it doesn't grind when down shifting into 1st. up shifting is not a problem smooth as ever. here is the history, 1963 Galaxie 500 xl 427 and a t-10 4 speed. trans was just rebuild, new syncros, slider assemblies, and new bearings. new clutch was installed when trans was installed.