2003 Corolla - 6-Speed

#1
Hey all i have 2003 corolla with about 170k.. it has been converted to 6 speed.. i noticed now that when i either downshift at times it grinds. what could be the problem, i bought the car this way..
 
#2
ok so it shifts good to 2nd 3rd 4th and 6th, some times when i down shift to 5th from 4th it will grind a little, and if im downshifting from 6th to 5th it will grind, other then that it runs good and shifts ok.. also what i noticed is if i rev it a little bit to shift to 5th from 4th or 6th to 5th it does not grind a bit weird but i will double check that and let you guys know
 
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