Vibration issues on 3/6 drop

[HtxChapter]

Just bought a 2015 single cab silverado 2 months ago, got a full 3/6 mcgaughys drop kit and noticed a vibration when going about 30-40 mph the center console shakes a lot. Anyone know how I can fix this vibration issue?

 

 

 

 

[dla]

Not sure how McGaughy's addresses pinion angles with their flip kit but my Belltech kit included 2° pinion shims. Mine were originally installed backwards (turning differential down) and I experienced the same vibration, once I turned them around the vibration was gone.

[cornell1]

Strange for a first post but I have a 2015 Silverado 1500 LT 4 cyl / 6 cyl, it shakes hard when it is in V4 mode, as I apply throttle. The shake goes away when it gets into V6, then happens again as I slow down. It does not matter what speed I am going, but it is consistent in the 1000 to 1400 rpm range. Local GM dealer found a tech bulletin on it, took cab off, uncoupled exhaust, moved cab mounts, reclamped exhaust, and it made no difference.

 

Its a unique configuration with a 6.5' bed, crew cab, Z71. It has only 11k miles on it, should not be an issue but is very frustrating. Dealer wants to find another just like it to compare to. I think it is related to a V6 motor you cant deactivate 2 cylinders and have it still balanced. Am I wrong?

 

Driveshaft is fine, wheels, tires, etc all fine. Has nothing to do with shifting, although the newer truck searches for the right gear often, as it has a 6 speed transmission.

 

Anybody with thoughts?

[DirtyMarcus]

For the crew cab standard bed belltech makes a carrier bearing kit. I had to get one installed on my truck when I lowered it.

 

http://www.belltech.com/catalog/product/view/id/14085/category/4/

 

For the rcsb you may need shims.