Subaru Impreza GH3 (Manual) Transmission issues

[DavidBoro]

Guys, am having transmission issues with my Subaru Impreza GH3 2008 model which is a manual Transmission. When shifting from gear 2 to gear 3, it kinda get stuck somewhere in between especially when am on high RPM's and slip off when i release the clutch. In short am usually forced to put it in slowly motion for it to engage. What could me the issue here and it happens only with gear no. 3. I have tried to search online, but answers coming up are change the gearbox oil, adjusting the cables etc. your help will be much appreciated.