Grinding 5th

actually im sure that the t-5 in our cars has syncho's, i had replaced it when i did my rebuild. also, thats classic symptoms of a worn synchro. If it is, it will get worse, grind, then pop out of 5th eventually. Just be to be sure tho, check your clutch, make sure its dis-engauging al the way
 
Cobra spec T5's have a blocker on Reverse. Others have reported seeing a blocker on reverse in other T5's - I think they might have had [aftermarket] HD WC T5's, which often incorporate aspects of the CObra and Z-spec box.

5th gear should have a synchro. You guys would know if you didnt. OD often uses a soft synchro though (like bronze, instead of fiber).
 
This is all interesting, I've NEVER heard of a 5th gear grind....I've always just eased it into 5th for the simple fact that if I have to shift quickly to my last gear, I've already lost the race