Engine Virbrations @ 3,100 RPM in 4th & 5th

[Meir]

Originally Posted by Highrise

That's definitely it!

After a little googling, one of the other common symptoms of a bad engine mount is the gear shift moving back and forth under acceleration, which mine does.

Thanks for such a quick reply, looks like I have a new weekend project.

Tip.
Job is much easy when removing the coolant hoses.
Good oportunety for coolant flush as well.