sac55

Lol no. Turned out that the crossmember had somehow become warped and when the engine torqued, the skid plate was hitting the transfer case. I guess this is why the sound was intermittent. This is probably the last thing I ever would have expected. The damage was underneath the skid plate and it looked fine when everything was still. That’s why when I would get underneath the truck to look at it, everything looked fine. It was only discovered once the skid plate was removed.

Hi all - I am hoping for some help/advice/thoughts/suspicions. I have a 2016 Crew Cab Z71 5.3 Silverado. I have 20' fuel wheels and 33 inch Toyo Open Country tires. I have a 3' front spacer and Bilstein 5100s. Intermittently, I hear a clunking noise when I accelerate sharply from a full stop, example - foot on brake at a stop light, green light, hit the gas and there is a quick clunk. No loss of power, doesn't sound like anything is grinding. The clunk never exists on a light acceleration and is only intermittent on the sharp acceleration I described. No difficulties when putting the truck into gear. This has been going on a few months and I've done research here on the forums and elsewhere. My first thought was the u-joint, sway bar and even a slip yoke or engine mount problem. I took the car to the suspension place yesterday and they said everything looks good there. This morning, I took the truck to the dealer and they were able to replicate the noise but determined it is not drivetrain related. Anyways, they likely won't figure it out until tomorrow. I'm trying to stay optimistic but I am also never optimistic when my truck is at the dealership. I am not a mechanic and never would pretend to be. I know that many people have had this problem and it seems like the consensus answers don't fit here. Other than what has already been eliminated as the source of the noise, does anyone have any hypothesis as to what this could be? Thank you in advance.