I've got a 2012 Silverado. 5.3 1500 z71 4x4, active fuel management delete, cab and a half, short bed, and factory suspension and exhaust if it matters. I bought it used at 130k miles so I don't know it's full history, just that it's a rebuilt title. I've got an intermittent vibration, almost constantly. Let me explain. When I bought the truck I noticed it at a specific rpm range/speed. It was 35-65 mph and 1300-2k rpms under a load. It would vibrate for 2 or 3 seconds and stop for 2 or 3 seconds and repeat but went away when accelerating faster than 2k rpms until engine speed comes back down. Not gear dependant. Fast forward to 140k now it's noticed at all speed ranged up to 70. And recently I felt it up to 2300 rpms so it's getting worse. I've also noticed that at lower speeds (up to 45ish) that the tach will respond with the vibration. Up 100 rpms or so then back down when vibration stops again. The dash and computer only show traction control fault from bad steering angle sensor so traction control and stabilitrac lights are on, no other trouble codes active or otherwise when scanned. The truck preforms everything great. Plenty of power, 4x high and low, acceleration, and braking, towing, ect. Since I've owned the truck I've replaced tires around the entire truck, all mounted and balanced with full alignment at a shop, all brake hardware(pads, rotors, drums, springs, wheel cylinders, rear shoes, brake fluid, ect. Oil changes in transfer case, engine (x2), and rear end, replaced all spark plugs and coil wires with Delco parts, replaced the entire rear end assembly, and rear shaft u joints, front and rear. I'm a career boat mechanic but this vibration has myself and all my mechanic friends (marine and semi truck) stumped. The shop that did the tires and alignment let me know the front end components need replaced. Inner and outer tie rod ends, upper and lower controls arms, and ball joints. But vibration comes (and goes) from the bottom of the truck, not steering wheel. Also truck rides smooth as porcelain when you pull your foot from the throttle pedal at any speed. Cruising at 60, on and off vibration with cruise control or throttle. Break cruise control or release pressure off throttle pedal and vibration completely goes away. And the most mysterious symptom is after 30-40 minutes of straight highway speed (50-70+) the vibration goes away entirely and is only felt every 20 minutes or so. Ideas?!?

 

I have the same issue exactly on my 2010 Chevy Silverado LTZ with 65k miles on it. Still no answers. The sunroof clicks when it rains and the power mirror plus seats all click and are broken from junk gears installed at the factory. I would like an answer to the problem also.

 

Any updates on this? I'm finding myself in a similar situation