it pops out of 4th gear while driving. all the other gear is fine, wtf..... anyone has encounter this experience or what I need to buy to fix this issue. tried posting on tech. no luck..

 

I know in fifth gear it can pop out due to low transmission fluid...fourth could also do the same...give it a check just to be sure. If it is not low then it is definitely an internal problem which would require pulling it and repair, I hope that is not your case. If it is low, you should drain and refill with Honda MTF to be safe. Good luck!

 

no it's an internal definitely. change the oil twice. no metal shaving came out. must be a bent shift fork.