Ulupna450

I've changed my oil in my '07 hilux sr5 manual. The reason for this is that it was getting hard to get out of 5th gear. Still is. Reverse is also hard to engage also. The clutch is an Exceedy (?) HD 4wd 12 months old and does a lot of towing. Its fine. I lost a bit of oil from a blocked breather (I assume...) as the oil came from the top of the box. Pressurised, then blew its load everywhere! Hopefully the box is ok, as I'm in Qld on holidays, but from Melbourne! Any suggestions???