Hey guys, this is my first post here...never had problems with my Jetta.
But, just today, my tranny is shifting hard, with a loud clunk right at 35mph when going from 3rd to 4th? It doesn't do it every time, but has never happened before. The car has 101,000 and has been maintained well.
What things should I check first before getting too worried about a tranny rebuild or replacement?
Thanks in advance. Auto transmission 1.8T 01 Jetta

 

Gee, thanks for all the replies?
It was a worn out transmission mount...

 

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