Trans 5th gear whine

[Eilermoon]

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 after the swap, I didn't notice the whine for a bit. Does this sound related? I plan to remove the shifter to make sure the gasket is seated correctly and I'm changing the trans fluid this week as well.

I've got the TR-3650 in my '03 GT for reference. Thanks!

 

[Mustang5L5]

Aftermarket shifters are known to cause whine noise to be amplified.

verify fluid level is correct as well. When fluid levels drop, trans whine can be one of the first symptoms to pop up

 

[MustangIIMatt]

When my last 3650 had a whine in 5th, it eventually ended up having to be torn down due to a broken snap ring that got caught between shift forks and left the transmission stuck in 5th.

When my first 3650 had a whine in 5th, it was nothing. I drove that car like I stole it for 15,000 miles over the course of a year before I was offered stupid money (more than I owed on it) for it and sold it.