Good morning to all,

I have a new 2019 Ford f250 XLT 6.7 and at 400 miles I began to notice a noise. When I first bought the truck it did not have this noise. The truck now has 1200 miles on it.
While driving at low speeds, approximately 10-35 mph, then briefly letting off the accelerator pedal then back on the power, I get a light clunk noise. It is not real loud, but it is noticeable. The transmission is not shifting at the time of the clunk. The transmission could be either in 1, 2, 3, or 4th gear when the clunk sound is heard. (I have not heard it in 5 or 6 gear).

Things I know:
It is powertrain related.
It does not happen all the time, mostly at low speeds.
The transmission is not shifting.
Happens mostly after engine is fully warm and truck has been driven for 20 minutes or more.

Could this be:
The drive line slip yoke
Tranmission
U joints (front or rear)
Rear axle pinion gears (I do have the electronic locking rear axle)

Can someone suggest how to test (or test drive) these components and determine where the problem area is?
I would like to be informed before I go to Ford. I don’t doubt they will say, “It is operating with Ford specs”. This is my first truck so I don’t know what operating sounds are normal and what are not.

Thank you for advise

 

That is what they will tell you. I’m at 49,000 Km, I still notice it but it is normal. Same with my 2006. I guess I am just used to it. Mines a long box too, so it’s a long drive shaft and a lot of components.

The way to test is examine the truck on jack stands, assess the movement separately at each u-joint, slip yoke, and rear end. It’s the summation of clearances across each of these components I think your feeling. As long as each component is in spec, you don’t have a issue. Well a safety issue. I would just be careful to check the u joints and slip yoke. Entirely possible to have a component that’s not right, then take it to the dealer to have warranty address.

 

Similar reportings can be found in these threads. Maybe look them over and see if your experiencing the same. Both of my 2017 and 2019 SDs have the 'clunk'.

https://www.ford-trucks.com/forums/1...ine-clunk.html
https://www.ford-trucks.com/forums/1...ity-check.html
https://www.ford-trucks.com/forums/1...-thoughts.html

 

I have it as well. Have experienced it twice, slow speeds, stop and go traffic on the freeway going to work. Doesn't do it during normal stop and go city driving or other conditions. Just when crawling along 5-10mph on the brakes off the brakes, etc. To me is sound like it's coming from the front end or right below the cab. I have read all the other threads and nobody seems to have diagnosed the issue or that is actually posses a problem. Only have 2200 miles and lot's of warranty left. Not going to worry about it unless I start to hear it in other conditions outside of the two times I have heard it.

 

Thank you everyone for your response. It appears this is a common issue with the clunk sound-some trucks have it, some don't. My transmission shifts smooth and I don't have power lag. I will have Ford check it out so it is documented.