bob m

So, I make an appointment at the dealer to resolve that noted "whirly" sound, Coincidentally I was noticing a rough scraping sound/feeling on the floor of the car. I was thinking bad wheel bearing, but turns out there is a crack in the differential. Huh? I drive fairly conservatively. What would cause that? Also, does this affect a Car Fax rating on resale?
On a side note, the dealer gave me a 2018 Q5 - I haven't driven an SUV in a couple of years - 20014 Q5/2016 Macan and going from a low riding A4/A4 Allroad to the Q5 is a totally different ride. I'm enjoying the change - at least until next week when that part comes in.

Allroading17

I had a similar failure on my first allroad. It wasn't cracked though. The gears internally Grenaded causing me to be stranded.

At least your dealer is taking care of it for you. I don't think this would affect resale

bob m

Grenaded -???

What year Allroad?

Allroading17

They broke apart- ruining the diff

MY17

breadbooze

Usually if a diff is cracked either an outside object caused the damage or a defect in the diff. Sometimes it's a bad diff bearing that cracks the diff casing from thermal expansion. Won't know for sure until the diff is removed and inspected.

bob m

It's from an internal defect - as I was very curious how this could have happened.
Still waiting on that rear diff to come in from Germany. Meanwhile the loaner Q5 is a pleasant change.