About a week and a half ago I purchased a 2010 FX4 Super Crew that had right at 14,000 miles on it. I have noticed the rear end making a clunking noise when stopping/braking or coming to a rolling stop (without touching the brake) - downshifting from 2nd to 1st. Yesterday afternoon, I dropped the truck off at the service department at the dealer where I bought it and they looked at it and called me yesterday afternoon to tell me that it was ready - they drove it, heard/felt the noise and reprogrammed/recalibrated the transmission and that it was not making the noise "as bad" and that the truck just has to learn how I drive (whatever!). I pick it up, and while it has not done it as often, it still does it. I have searched this forum and have read about the slip yoke problems and I am assuming this is what is probably wrong with my truck. My questions are:
1) What/where is a slip yoke and what does it do?
2) If not fixed, what potential (worse) problems could occur down the road.
I was not expecting this from a newer vehicle and from what I have read on here, it just seems like a lot of the service departments "mask" this kind of problem with a quick fix (like what they did to mine yesterday).
I bought this truck wanting to put a 2 inch leveling kit and tires on it, but now I am terrified to do that because I can't afford for the warranty to be voided.
Any suggestions, anyone?!?!