I have a 08 ram 2500 5.7 Hemi 6ft bed 4 door with 145k on it i have worked on a lot of rams but this one is being a pain in the a## i have tried everything i have a vibration around 45 u start to feel it in the seats /steering wheel then when i hit 60mph+ the thing rattles/vibrates like crazy i cant tell where it is coming from feels like the middle of the truck but then why would i feel it in the wheel? it is NOT the death wobble. Things i have done so far Re balanced tires, replaced every dam ujoint on the truck, took front driveshaft out to see if that was it, flushed front and rear axles, replaced both front hubs, new rotors no pulses in the petal, Keep in mind it has always had this issue since i bought it 7 months ago i got a good deal on it i guess this is why. Also another thing i noticed no idea if it has anything to do with it but transfer case leaks someone replaced it at one point says 2016 on it can a transfer case cause this issue? 4wd works fine

Any suggestions appreciated cant even sell the truck cause no one will buy it like this i am stuck with it....

 

Take the drive lines to a shop and have the balance checked, they could even be bent.