Today i was driving my bro's gsx and everytime I shift it into fourth gear, it just grinds for some reason, every other gear is cool except for fourth gear. So can somebody here help me out, I dont know what the problem is. Thanks

 

It *could* be a maladjusted clutch pedal, but most likely it has a bad 4th gear synchro. They're not too expensive (the part) but the install is what kills ya. Try and empty the transmission and then fill it back up with BG Synchroshift, that should at least help and *could* fix the problem, otherwise you'll be spendin' some buckaroos.