Grind from 2nd to 3rd on high rpms

I decided to step on my car two weeks ago and heard a nastry grind from 2nd to 3rd when shifting close to redline. So I stepped on the car again every once in a while to notice that its still happening. Its never been like that. I searched and read about people saying to get Pennzoil® Synchromesh Fluid. Does that mean that I just need to replace my tranny fluid or does it mean that my tranny might be going out?

could mean its low on fluid, but its doubtful. sounds more like a syncro problem in which case over time it will completely wear out and the trans will need to be overhauled.

try the syncromesh, it works for some…

does double clutching make that gear last maybe a little longer if done all the time?