I have read a few other threads about people with the same issue - pop under driver left foot from the cab mount. There is a TSB out for it so I know I am not going crazy. I have tried 3 different thickness shims with no luck ranging from 1/16" to 3/16" - even did all new OEM cab mounts all around. Every time I adjust the shim thicnkess and re-torque with loctite the noise goes away for about 50 miles them comes right back - more noticeable when its cold out.

My question is to the guys that have shimmed their front mount what thickness shims did you use?

TSB - https://static.nhtsa.gov/odi/tsbs/20...53418-5084.pdf

 

I tried new mounts and some shims but I don't remember what size. Nothing worked until I spent the extra money for the S&B premium silicone body mounts. I have had them for about a year and all is smooth and quiet!

 

I have a 12 also. Where do I find the build date ?

 

+1 S&B, we sell them. Installed on our shop truck.