I get a vibration or rocking from side to side on my 06 screw when I'm going 70-75 mph. I took my truck to the tire shop and and rebalance my tires and they said they tires were still in balance and were not out of round. But I still have the vibration at the same speed. Could it be that the tire shop is wrong and my tires are bad or is it my suspension? Any help is appreciated.

 

Did they force balance on the vehicle? I would swap tires (front to rear) and see if it makes a difference. If you search this forum you'll find others had similar issues and having the tires dynamically balanced on the truck helped the issue.

BTW- what configuration is your truck, size tires??

 

my tires are 255/75/r17 bridgestone dueler a/t revo. my truck is an 06 screw 4.6 2wd with a leveling kit on the front