2015 f150 3.5 eco boost , 6 speed trans, electronic locking rear. When I come to a stop, I can feel a bump in the transmission/drive train. I also experience this while driving and take foot off accelerator for a moment, when I re apply accelerator I get the bump or ‘slap’.
I can already envision the Ford Dealer experience on this problem. They’ll say they couldn’t reproduce the customer complaint. So I will have to drive the vehicle with mechanic. It is still under drivetrain warranty.
My question is, is this a common complaint on this transmission?

 

There might be a pending service campaign on it. I'd inquire.

 

I'm not familiar with this particular trans, but this is a common complaint that has been around for years. It's caused by a dty slip joint in the driveshaft. Ford has a special lube just for slip joints.