Installed a magnaflow the same length as stock muffler and got a tad more rumble and no resonance. Perfect volume but I'm looking for louder. Gona switch to a shorter magnaflow and I'll post go pro video footage soon.
Had the exact same symptoms going on which got worse. Dealership found metal shreds inside the transfer case and replaced the transfer case under warranty.
FordService Thank you for your help. Dealer replaced transfer case and truck is running perfectly. Thank you for finding out I had an extended warranty! Thanks for making sure the dealership took care of me promptly!
I'm literally having the same grinding issue. 2011 60k miles. Dealer is saying to replace transfer case for $2100. Ran the vacuum line idea by the service advisor and he told me otherwise.
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