I have a 03 2500HD with a 6.0L and I get a vibration between 70-75 only on acceleration. I have rebuilt my front except formy lowers, brand new tires and rims, brakes are new all around. The only thing now i could possibly think of if my driveshart is out of balance (it has surface rust because its a Michigan truck) or my u-joints are bad and im not really sure how to check them. Any help would be nice

 

Way I check U joints is crawl underneath with it in park, try to roll the drive shaft back, and forth. If you have play, probably need U joints. If you have alot of miles, or harsh environment, replace them I'd also suggest you get the non sealed ones so you can grease them.

 

I've got about 144k on it and its a Michigan truck. I asked around and it seems like the common answer is u-joints