David clardy

[David Clardy]

 there is a thud under the passenger side floor board when I stop. in my 2018 Silverado LT 2500hd 4x4 Duramax.

[DmaxHugh]

10 hours ago, David Clardy said:

 there is a thud under the passenger side floor board when I stop. in my 2018 Silverado LT 2500hd 4x4 Duramax.

Check your DEF tank or cab mounts. I had a similar thing with my Ram and it was the cab mount wasn’t tight. My 2019 Duramax has 35k miles on it now and no issues. Knock wood!! 

[David Clardy]

Ok. Thank you for the input.