Driveline “thunk” during hard acceleration

[Friday yet?]

First, I have searched multiple times to find this specific topic and cannot. So when/if one of you fine folks post a link all I can do is apologize. I tried.

Ok, here goes. 2023 Tremor. 47K miles. Owned since it had 3 miles or so. No issues, including the transmission. (Sorry to the other half of the forum that just groaned. But my trucks runs great.) Recently replaced the DPFE but no biggie. Truck has honestly been stellar.

However, 2 maybe 3 times in the past month or so I’d be running at highway speeds and for whatever reason would goose the throttle rather hard, and would get a very noticeable “thunk.” Doesn’t act like the trans as it seems to just downshift and be ready to go. And the truck does go. No problem. But what the hell is the thunk?!?!?! I mean it is noticeable. You can’t miss it. But it’s only done it a very few times. Last one occurred a couple of days ago which is when I started searching the forum.

And again, highway speeds. Not the start/stop thunk that has a gazillion threads. No issues when starting and stopping. Two days ago I was running about 74mph when I punched it and got the thunk.

Thanks in advance for the input!

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[ScarzRanger21(2.0)]

The wife’s ranger and mine does the same thing. I’d assume it’s play in the driveshaft. All my fords have done that. Hell, my brand new work truck does it too lol

 

[RangerBill]

First, I have searched multiple times to find this specific topic and cannot. So when/if one of you fine folks post a link all I can do is apologize. I tried.

Ok, here goes. 2023 Tremor. 47K miles. Owned since it had 3 miles or so. No issues, including the transmission. (Sorry to the other half of the forum that just groaned. But my trucks runs great.) Recently replaced the DPFE but no biggie. Truck has honestly been stellar.

However, 2 maybe 3 times in the past month or so I’d be running at highway speeds and for whatever reason would goose the throttle rather hard, and would get a very noticeable “thunk.” Doesn’t act like the trans as it seems to just downshift and be ready to go. And the truck does go. No problem. But what the hell is the thunk?!?!?! I mean it is noticeable. You can’t miss it. But it’s only done it a very few times. Last one occurred a couple of days ago which is when I started searching the forum.

And again, highway speeds. Not the start/stop thunk that has a gazillion threads. No issues when starting and stopping. Two days ago I was running about 74mph when I punched it and got the thunk.

Thanks in advance for the input!

Still might be the driveshaft spline needing to be re-lubed. Might also be the driveshaft carrier bearing assembly needing to be replaced.

 

[Friday yet?]

Still might be the driveshaft spline needing to be re-lubed. Might also be the driveshaft carrier bearing assembly needing to be replaced.

Been wondering about the spline needing lube. Guess I’ll need to try that.

gonna wait for a warmer day!

 

[rhcr115]

https://www.therangerstation.com/tech/fixing-a-driveshaft-clunk/ gunna do this around 40 k on my ranger. I got it at 21k and it was doing it for the first 5k but ever since I leveled it and out bigger tires it went away.? Maybe it’s just the cold weather making it better.

 

[Dereku]

I lubed mine at 105k. Didn’t notice how bad it actually was until it was gone. It dos help. Buy the right stuff. Its blue ptfe lube I think.

 

[rhcr115]

I lubed mine at 105k. Didn’t notice how bad it actually was until it was gone. It dos help. Buy the right stuff. Its blue ptfe lube I think.

It’s this stuff. http://amzn.to/2ovdND6 motorcraft xg-8 ptfe

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