Have a 2009 santa fe 2.7 automatic fw drive and replaced right front drive axle due to a bad boot and have a vibration at 20mph then goes away and also a hard shift from 3rd to 4th which was there before i did axle. Tried 2 cv axles and same problem. Any ideas?

 

There are a few things that can produce a sense of vibration. I don't believe the vibration is related to the shifting problem, but you never know.

At this time do you know if the "Vibration" you feel is speed related or could it be coming from the engine?