i Have a 2007 8 and about 6 Months ago i blew out my Differential and had to get it replaced so when i did and got it back, i noticed that it would shake around 70MPH and Up and the faster i go the more aggressive it would be. im not sure what the problem is but i would really appreciate any help that can be offered to bring my 8 back to its former glory. thanks in advance im desperate for help .

 

Did this happen immediately after you got it back or developed over time? I would take the car back to the people that did the work first. Could be as simple as a loose or unbalanced driveshaft which would make it dangerous to drive.

 

Or poorly aligned power plant frame. Or poorly secured diff. Shaking can be many things. Get it up on a lift, potentially remove the diff again and reinstall it following the shop manual this time.

Could also be poor installation or damage to the axles. Don't forget to examine those.

 

yes noticed it on my first drive, i was told it could be the bushing mounts but im gonna take it in again and get the diff removed and re installed.

 

It could be that too, but I assume it was fine before the shop touched it?

 

Yeah it was riding smooth before

 

Reinstallation error most likely. Hopefully nothing is damaged because of it.