Knocking Sound...2017 SR5

I have a 2017 Tundra SR5. Every time I start my truck and drive off, I hear an audible "knock" at the shift point around 30-35 mph. It only happens once and then it seems to go away after that. It happens every time I drive off at the shift point around 30-35mph....without fail. I am not referring to the "ABS Check" that occurs when I am taking off at lows speeds...I understand that is normal. The truck seems to be running great otherwise...but this knock sound is starting to concern me. The sound appears to be coming from below the floorboard or behind the engine...that's my best guess.

I have plans to take my truck to the dealer on Friday to have them look into this. Just thought I would run it by you guys before I do so.

Any feedback would be greatly appreciated.

 

Let us know what happens at the dealer. Good luck.

 

Any luck on that noise? Mine is doing the same thing. Happens the first time I get up to 15mph and then goes away.
2017 Tundra Limited TRD off-road.

 

Under the floorboard and behind the engine location sounds like from the transmission. Single clunk simultaneous with a gear shift at 30-35 mph sounds like the transmission. Your 2017 is still under drive line warranty. Unless it's something minor they can "adjust" out, or they can eliminate with fluid change, you could be looking at a new transmission. Toyota dealers don't try to repair transmissions.

Edit: Just noticed this thread started more than two months ago. I'm guessing the problem has been resolved by now.

@17LmtdCyp the OP's issue was at 30-35 mph. At 15mph, I suspect a single clunk is likely the anti-lock brake controller self-check. Search for numerous threads on the topic.

 

Update:

Left it with the dealer for 5 days. They were able to detect the knock but they were not able to identify it or fix it.

Frustration sat in and I gave up. I have decided to live with it as it only happens once each time I drive and it has not gotten any better or worse.