why does my car pop out of 2nd gear on 1998 Honda Accord

the transmission is a manual tranny from an 07 accord. this doesnt happen very often but when it does, it makes a grinding sound. also, how much would this cost to repair?

Asked by for the 1998 Honda Accord
Maybe a 1997 accord into a 1998? 2007 Accord trans is on drivers side , 1998 is on pass side , but no matter , syncros are on inside-out?
1 more answer
maybe the linkage is incorrectly adjusted.