2020 3.5L 10-speed 69k. Noticed it randomly thumps/clunks when decelerating/slowing down on straight aways. Doesnt always do it though so I can’t really recreate it. I’ve only noticed it going down our town Main Street at like 15-20mph. Thoughts? We just bought the truck and saw/felt no issues at the time. Dealership had all new tires and brakes put on and serviced the whole thing.

 

Nothing on light acceleration?

Do you have a 1 or 2 piece drive shaft?

 

1 piece. Nothing on acceleration. Wondering if it’s just the 10-speed doing weird 10 speed things every once in a while.

 

Very possible. Can you drive it in sport mode a few days, it will change how the transmission acts.

 

Mine clunks on the off ramp as it drops down to 4th gear (usually 4th) almost every time I come home from work. This is on a replacement transmission right at about 1,000 miles. It did the same before this newer one.