Eclipse RS Transmission 5th Gear Problem

I have a Mitsubishi Eclipse RS 1999 2.0LQuestion: I had a mechanic rebuild my  NV-T350transmission.  He has finished it but he said that the gear for fifth needs replaced. It has brand new syncro's and won't stay in fifth. What is the part i need?Answer:   You will need the  5th gear set your cost $125.00We would also recommend that you purchase a 5th syncro slider $45.00 shipping charges will be added.Give Scott a call toll free 888-824-2012 he can help you.