Well I've developed the dreaded gear whine in upper gears at speed under light load. Fluid change no real difference. I'm now out of warranty on my '15 for this, though I called Ford corporate about it before. I've noticed some part places are dropping the input shaft bearings that are known to cause it. Mine's not loud yet - just constant - so it gnaws at me. I'm trying to figure if I need to dump the car and get a Jetta GTI etc.(?) or if I have some assurance that this can be remedied at a reasonable price into the future. They didn't make many STs and now of course it's all about SUVs and trucks in the US. I've heard of guys getting replacement trannys that also did it. I could sell and buy an '18 or '19 - yeah I do love the car - but would it do it too? Just trying to get piece of mind as I go forward. The slave cylinder is known to go or the clutch dual mass problems, or just clutch wear, so eventually the tranny will come out and I would hope to address the bearings then (if they don't fail sooner). Why don't Toyota bearings fail like this? I have wondered if the axle seal leaks are correlated to this by low fluid level starving these top-most bearings?