Synchro needs fixing. It's job is to mate gear speeds so you don't grind going into gear. Your pause between 4th and 5th tells all, it's allowing the synchro more time to do it's job.
Cheap way is to pull the trans and sandpaper the syncro a bit to allow it to grab better, smart fis is to put a new synchro ring in.
Cause nothing sucks worse than pulling the trans, tearing it apart to do a cheap fix only to fond out the cheap fix didn;t work or didn't last long.
Originally Posted by slvr2000stang
Holy crap he's right.