2012 silverado Vibration at 25

[Travis1500]

Got a 2012 silverado single cab short bed 4x4 i started feeling a vibration in the seat and floorboard at around 25 this started right after installing my 2 inch drop shackles i checked for play in driveshaft and felt nothing but i replaced both u joints anyway still got the vibration someone told me i might need pinion shims which is irritating because i was told i wouldent need them with just the 2 inch drop i put a 2 inch drop and a 2 inch level in the front to level the truck it looks great but will this vibration damage anything over time if I decided just to live with it

 

[CamGTP]

No it won't really damage anything, it will just be annoying at that speed.

 

Pinion shims are cheap and will take maybe 20min to install them with power tool, I'd figure out what degree you need and just install them.