Hi Folks! I work at the US Embassy in Lisbon Portugal and have a 2003 Ford Explorer. It's a 4 X 4 with a 4.0 V6. It does this strange jerking / hesitation when I'm up past 50-60 miles an hour when there's a load on the drive train. I've found a old thread that exactly describes this problem and says it's resolved by replacing the 4 X 4 module mounted behind the glove box. I called the dealer and they say they have the part but it cost $325 and that a dealer tech must program the part. Yet there were people who described just changing the module themselves and fixing the problem without a dealer's help. Here in Portugal, I'm wondering if I can skip the dealer, order the part and replace it myself. Anyone had experience with this issue? Thanks in advance for your help!