I have a vibration issue but I'm not sure it's the same as A lot of people on this thread have.
First I will list my specs and then my problem.
Truck: 2016 GMC SLT Crewcab 4x4
Motor and Trans: 6.2L w/8 speed, Max Trailering with the 3.42 rear gear
Modifications: Rough Country 2" front leveling, 3" rear block, 275/65 20 BFG TKO's on stock rims
My Issue: I have a vibration that starts at around 51mph and then peaks at 54-55mph and stops around 59mph. Here is where I think my vibration might be different than a lot of other people in this thread. Mine seems to get worse when applying light throttle and it gets better when I coast or put the truck int neutral while I'm in the speed range of the vibration. I have had my tires balanced 4 times and the last 2 were road force balanced. Given the fact that my vibration can be altered by throttle/acceleration I'm beginning to believe that my issue might be my torque converter.
Has anyone had an issue similar to what I am experiencing?
Also, are there common variables for trucks with vibration issues? Are they all 5.3's or 6.2's or both or do they all have 6 speed or 8 speed transmissions or some other group of common factors?