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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
toughest thing to diagnose IMO is a front end shimmy. Too many possible causes from tire balance to alignment to ball joints to axle balance. But yeah, you start with the most common and go from there, look to the tires first...
might want to check to see if a belt let go in one of the tires if they are still stock, this just happened to me. also check the rack on either side, but tires are more then likely the cause.
Just one other thing you will want to check.... 06 had a recall for the front hubs which would cause vibration at highway speeds. Make sure this was done, the dealer can look it up for you.