Good to know :thumbsup:It's the exact whine, just 80% less audible.I've read about the issues with the MT-80 and resultant class-action lawsuit against Ford. Dang.

Hi everyone. The whine became worse in 5th and 6th, and is now audible in 4th. Not knowing exactly which part in the diff was on it's way south, I ordered the 3.73 gear kit from LMR, which comes with everything. I had a local, trusted shop do the work. Over the course of the teardown the shop...

Thank you, Jared. I plan to borrow blacksheep-1's jig to clearance the towers and get -3°. I doubt I will go past that, but you never know ;)Noted, sir.

My new shoes are on (19x10 ET40 + 285/35/19). Yay.I had an alignment check performed—how do y'all feel about the current specs? As always, I appreciate your input.

I hadn't considered the weight of the sound-deadening mats. Thankfully they are low on the platform and between the axles... the other consideration is determining ROI.

I really hope I do!

Yep. Will do that moving forward. Interestingly, the individual boxes showed no signs of being previously opened...

It turns out that four of the plugs were improperly boxed. Sigh.The idle relearn and new, correct plugs have helped with the compressor-on stumble, which now occurs every third cycle on.Thank you all again for your help!

Thank you—based on your recommendation I inquired with Dynamat:Q: I have installed aftermarket suspension components with poly bushings. The gear whine from the transmission and differential is amplified by the more direct connection to the unibody. Do you have a product that will reduce the...

We swapped in the OE upper control arm and bracket, and the whine is reduced by at least 50%.I would consider the GT500 upper control arm, but it will not allow adjustment to achieve the desired -2° angle.So... the BMR parts will go back on, and I will deal with the whine.Thank you all...

I am 90% confident that the gap is correct on all of the plugs. I will verify.Checking the coil connections right away.She runs great off idle. Yay!I disconnected the battery for 30 minutes hoping to force a relearn. No improvement.

Coyote cognoscenti, regarding my 2014 GT with 25K on the clock:Background: With the AC on, when the compressor cycles on, there is a drop of 250 RPM, but the car felt like it was strugglling a little to regain RPMs. A friend suggested new plugs (the car previously ran on California gas)...

Great idea. Thank you, sir.

https://trackmustangsonline.com/threads/gear-whine-after-whiteline-rear-upper-lower-arms-installed.7789/This gentleman had the same experience. I suppose what I hear is a normal result for introducing much more rigid upper and lower arms and mounts, with poly bushings to boot...

Great point and thank you, sir. My memory is not what it used to be... I did use the RedLine product that has the friction modifier.Yes sir, we will do that. Thank you.