ANSWERS: 1
  • 1st question: Just guessing, could be needle bearings in universal joint? Was a relativly cheap and easy fix on older trucks... not sure about the newer models. 2nd question: Still guessing, maybe your catalytic converter is getting too hot too fast and you're hearing expansion of the metal and heat shield? Sorry I can't help you much, should have more info on the problems. 1. Does the noise appear at a certain speed? Does it only appear after driving for a few minutes? Does it only appear after driving through a water puddle? 2. How many thumps and how fast? Is it there while cranking the engine or only after it has fired up?

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