has anybody had problems like this before. when i hit a bump sometimes my truck starts to shimmy. BAD. i cant really tell what its doing. its just a bad vibration. like the wheels go side to side. i know someone else has had this problem its a 2500 4wd with a cummins. its does have the cheap 2.5 lift spacers. i brought it to the alignment shop and they said everything is tight. the truck only has 98000 and its an 03. the shop did make adjustments but it is still doing it. only around 65 mph and up. (the faster you go the worst it gets.) the only thing is you have to hit a bump to make it start. any info will help. because the shimmy needs to go.