5th gear problems

Hey all! i just recently replaced my shifter with a short throw and love it! But about a week after install, my 5th gear began whining. It's only in that gear, when i shift to 4th at the same speed ~55mph, it goes away. I haven't heard this before the swap but it also didn't happen immediately...

Hello, so I noticed while driving the other day that my 5th gear is almost a dead gear. I found a pretty long stretch of road to test and see how she does, went well up until going into 5th and it pretty much did or does nothing at all. RPMS stay at a consistent 3,000 while in 5th no matter the...