Big Thunk form under and back
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Junior User
Joined: Jul 2004
Posts: 51
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From: McHenry, Il
Big Thunk form under and back
Driving my 04 350 PSD/SRW 1500k miles today I heard a big thunk from the back (twice). Both times my foot was off the gas going about 35 to slow down for a 25 mph zone (no brake). It was like I had something in big and heay in the bed that fell over (bed is empty) ( felt the second one). Then one more time when I was backing into the driveway.
I thought I saw something about this but could not find it. Any experiance with anything like this? (before I try to talk to the dealer about something I can not reproduce at will) (at least not yet)
Thanks for any help ......................
I thought I saw something about this but could not find it. Any experiance with anything like this? (before I try to talk to the dealer about something I can not reproduce at will) (at least not yet)
Thanks for any help ......................
Elder User
Joined: Jun 2004
Posts: 883
Likes: 2
From: La Crosse, Kansas
sounds like a U joint starting to make a little noise, but that shouldn't be in a new truck. crawl underneath your truck and tug on the driveshaft side to side and up and down to see if that could be the problem. maybe it's a little slop in your rearend that will get worse overtime. i had a similar sound in my 01, but it was the carrier bearing going out. stupid question....but have you used your spare tire recently? maybe you didn't get it synched back up there tight.
Freshman User
Joined: Dec 2003
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This may sound silly but might be worth checking.
From time to time I get a loud thud from the bottom back also. I traced it to the fuel tank. When I get to a half a tank or so, and when stopping or slowing, all of the fuel would slosh forward in the tank producing the above mentioned thud.
It only seems to happen at about half full. As soon as I fill er up, no more thud.
From time to time I get a loud thud from the bottom back also. I traced it to the fuel tank. When I get to a half a tank or so, and when stopping or slowing, all of the fuel would slosh forward in the tank producing the above mentioned thud.
It only seems to happen at about half full. As soon as I fill er up, no more thud.
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Junior User
Joined: Jul 2004
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From: McHenry, Il
I will check out but it is one of those thuds, that when you are a long way from home sends chills down your back).
Since the truck is brand new and the probelm is hard to produce on demand ... Is ther some way I can get the dealership to acknowledge this "issue" now, incase it manifests later past the warranty?
Since the truck is brand new and the probelm is hard to produce on demand ... Is ther some way I can get the dealership to acknowledge this "issue" now, incase it manifests later past the warranty?
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Junior User
Joined: Jul 2004
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From: McHenry, Il
I also just tried to move the diff. , either up/down or right/left and could not budge it..... just fyi .........
Last edited by phil350; Jul 31, 2004 at 02:46 PM.
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Logistics Pro
Joined: Jan 2002
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Phil350 I have tracked a thud...thunk sound to the slip joint on the drive shaft several times on my truck and two "friends" SuperDuty trucks. Pretty simple removal, grease and reinstal. About half an hour. On one truck the sound was a right rear cab to chassis bolt loose. HTH
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by mossygoose
I have a 2001 F250 and sometimes at start up I hear a loud noise like the brakes are stuck and they are releasing or 4 wheel drive popping out. I have yet to find the problem.
NOTE: Some of us have drilled and tapped the male yoke for a grease fitting.
Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by phil350
Driving my 04 350 PSD/SRW 1500k miles today I heard a big thunk from the back (twice). Both times my foot was off the gas going about 35 to slow down for a 25 mph zone (no brake). It was like I had something in big and heay in the bed that fell over (bed is empty) ( felt the second one). Then one more time when I was backing into the driveway.
I thought I saw something about this but could not find it. Any experiance with anything like this? (before I try to talk to the dealer about something I can not reproduce at will) (at least not yet)
Thanks for any help ......................
I thought I saw something about this but could not find it. Any experiance with anything like this? (before I try to talk to the dealer about something I can not reproduce at will) (at least not yet)
Thanks for any help ......................
(2) Most dealers are aware of the “Super Duty Clunk”. If you can’t find anything that’s obvious then tell them they need to grease the yoke. (I highly doubt that this is the problem, but you never know)
(3) Have you checked your spare yet as was mentioned?
Freshman User
Joined: Apr 2004
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Originally Posted by Big Orn
When you say "at start up" do you mean when you first take off? If that's the case the spline may need greasing with teflon grease. It's called the "Super Duty Clunk". Where the two drivelines meet, behind the carrier bearing, there's a slip yoke - take the back driveline off and lube the female splines on the front driveline liberally. Use teflon grease. For more info do a search on "Clunk".
NOTE: Some of us have drilled and tapped the male yoke for a grease fitting.
NOTE: Some of us have drilled and tapped the male yoke for a grease fitting.
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Joined: Apr 2004
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Yes, Just as the motor is started and idling down is when it happens most of the time. Sometimes I am in a rush and jump in and start the truck and put it in gear and it makes the noise just as I am about to pull off. I have never heard it any other time like stop and go or if I park and leave the truck running it will not do it again.