hard vibration from rear diff

[V6quattro]

The original rear diff from my S2 avant started to develop a loud vibration which was really noticeable at 80km/h and at around 120km/h it started to get scary. It sounded/felt a bit like two really bad rear wheel wheel-bearings.
I exchanged it with a S4 B5 diff and the vibration was gone.

So i took the old diff apart but no bad bearings or so. Only thing i fund was one of the diff bearings was loose on the diff. I thought the bearings are supposed to by pressed on?

Anyone know if this is bad? Are there more people with this problem?

[s2driveruk]

may explain some noise i have in mine still...in the spring will take it apart and inspect. Glad you sorted it with a replacement though

[V6quattro]

may explain some noise i have in mine still...in the spring will take it apart and inspect. Glad you sorted it with a replacement though

Do you also have solid rear sub-frame mounts? And I'm glad the vibration was gone after replacing the diff but i still like to fix my old diff as it has the diff lock option.

[quattro-nick]

that's not normaal in the movie
the inside ring of the bearing have to be stuck on the diff

[s2driveruk]

Yes solid mounts on the subframe and a powerflex rear diff mount...

[hiloran]

I thought vibrations will increase with poly mount?
How is the pinion end?
What kind of gear contact you have?
Are the bearing outer race surface ok? Roller surfaces OK?
Here new Timken bearings cost ~25€/pcs