OAM - F5 - WebSphere

Hi Team, We have currently OAM (Oracle Access Manager) and F5 and WebSpehre, to access the application running in WebSphere we have to go through OAM accessed via https, then OAM is integrated with F5 (http) and F5 with WebSphere (http). So the issue we are facing is that after we login into OAM, the client url is appended with the port number and we get a timeout exception. . If we manually remove the port number from the browser url then the WebSphere app is accessed. But if we access the application directly from F5 we are able to access the app. So is there a way that we hide the port from client url in F5. I am a developer and completely new to F5.