I know this subject has been hit on numerous times. My 04 is going into the dealer for diagnosis on the vibration I have. I am thinking it is one or both front axle shaft u-joints. This should all be covered under warranty, minus my $100 deductible. I know one or both hubs will probably get ruined, since the truck has 50,000 miles. If not covered under warranty, I am going to install a hub conversion kit, since I plan on keeping the truck. I have looked into the EMS, Solid Axle and Dynatrac kits. I am not leaning more towards one kit over the other. Any input would be appreciated. Thanks.