GoshenTop

I wanted to provide some closure on my whine/roar. After spraying the center bushing with lubricant and the whine/roar going away, I pulled the trigger and ordered a new center bushing. I used ramps on the passenger side to have the length of the vehicle up. I had to drop the exhaust, prior to cat (had to grind off the bolts), I then jacked up the front driver side to get the wheel enough off the ground so I could turn the driveshaft. I did put the transmission in Neutral, with the parking brake on and the rear driver wheel chalked. I removed the bolts holding the shaft on. The ends were "stuck". I sprayed with penetration fluid. I used some force, and mistakenly pulled the dust housing off the rear (very bad move on my part). I finally had to use a chisel and tap it out. The front came out with no issues. No matter the videos I watched. the amount of force I applied or the penetration fluid I applied, the shaft was NOT separating. After looking more at the rear of the shaft, I realized that by pulling off the dust cover, it was going to be an issue if I was able to get it back together. I had to order a new driveshaft. In the meantime, we drove the car for 2 weeks without a drive shaft with zero issues. No check engine lights nor performance issues that I could tell. I installed the new driveshaft, with the new center bushing and it's back to normal. No whine at all. At the end of the day, l spent a lot of time on my back and learned some lessons, but I think I still made out spending less than going to the dealer. I hope this helps someone.

Looks like I might have gotten lucky (I might regret typing that). On a whim, as a last ditch try, I sprayed the center alignment bearing with some silicone lubricant. As of today (2 days now), no noise. Even when seeing the Intelligent AWD indicate power sent to the rear wheels. That leads me to wanting to change out the bearing. My question to the group, what is the recommended approach to moving the exhaust out of the way? I'm seeing that I can disconnect before the catalytic converter. Hoping I can just lower it down enough to move it out of the way. It's looking like the drive shaft bolts are T-45. I've watched a few videos highlighting how to sperate the driveshaft. Hoping mine isn't too stuck.

Apologies for leaving out a key data point. 2015 Edge SEL AWD 2.0L The video is good. Thanks for linking.

Thanks to all who contributed to this thread. I started getting the whine noise a few weeks ago. I stumbled into the PTU issue, and replaced the fluid in that. Still, the sound remained, but would stop when I would get to around 40 mph. I NEVER thought of looking at the Intelligent AWD display to troubleshoot. As Pikuoff reported, I could track the sound to whenever power was sent to the rear wheels. The fluid change of the rear diff didn't help. Next step is to inspect the driveshaft center support bearing. Until I get my GoPro set up to film under the car, I had a follow-up question. Does the driveshaft always turn, or it is controlled by the PTU? And if so, is it safe to assume that the rear diff isn't engaged until it receives a signal to engage? (If it always spins, then if the center support bearing was bad, it would reason that the noise would always be present.) Thanks!