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So, yes, I've been driving it hard and the issue has gone away. I hope I haven't shortened the life of my hubs. I understand that a 6 cylinder and 10 speed transmission can have some rough spots in the power curve but that has improved greatly. Maybe resolution of a vacuum leak or the fact that...

So, They tell me it was a bad check valve on the IWE (integrated wheel ends) causing the front hubs to jump in and out of engagement. I guess the rough running was due to the vacuum leak vs having the front drive train suddenly engage. The thump was when it finally engaged. Parts will come in...

Recording it is a good idea. I should be able to capture an episode on the way to the dealer

Thanks for the info. Hopefully it is not a big deal. I'm not getting any error messages on the dash. We will see what the service department come up with

So, sorry my first post is a problem. This is my first Ford. I got the Raptor in February and I absolutely love this truck. We have a lot of rough Forrest service roads here and it just eats them up. 7,000 miles. For the past 400 miles, with gentle acceleration up a hill, it would occasionally...