I kind of suspect that it has to do with the truck sitting, even for a short time...maybe the fluid settling and then start up. When the auto start/stop is in use, the fluid doesn't have a chance to settle (time wise)?? My 2020 is starting to do it subtlety on hot days.

I believe it has to do with torque converter lock up...being engaged on start up. The converter is locked and disengages when the engine is started, sending the shock through the drive shaft to the ring and pinion gear. That's why you hear it as the miles start stacking up, gear lash...

 

Dealer is changing the drive shaft and Yoke.

See what happens.

 

I have a 2020 purchased on 8/8/20 did not have any clunking issues till the last couple of months. It has 23.300 miles and 10.000 have been towing an 8,000# trailer. It has MAX Towing and Payload package. Took it in today and they had it most of the day, they tried re-flashing guess it did not work. They are replacing the transmission valve body and will reflash...will see if this works...

 

Any updates on this? My 18 is clunking pretty bad.

 

Did changing those things work?

 

Seems to be way better. I think it slightly happened once or twice. But, I always make sure when I park it is always has some sway in the drive line.
But who knows. Maybe when it's cold it doesn't happen much. Now that spring and summer is here and warmer weather we will see.

 

This issue has been going on since introduction of the 10 speed and so far has shown to not be indicative of a future failure. Safe to say at this point that it is not a problem, but a characteristic.

 

Mine definitely seems to do it if I put the parking brake on first and then put the truck in park.

 

Yeah, make sure there is sway in the drive line before you put it in Park and the EB. Then it will never do it.

 

It helped some but still clunks...Going to try greasing the spline on the drive shaft...They had issues with Raptors and put this out as a TSB so figured I will give it a try nothing to lose...