OK. The nightmare is finally over. After weeks of agony (and many trips to the shop), it was indeed the GKN Axle causing the shakes. I replaced it with a Cardone Reman and the vibration went away. I will do a quick write up on a separate post so others don't go through what I just went through.
Thanks everyone for lending a hand. Truly appreciated!
Glad it worked out for you and good to know that the Cardone reman is a good one. My only question would be the quality of the boots, they might use cheaper quality ones so they may rip earlier. So keep an eye on it and of course if it rips, get the MB boot kits.
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