clunking noise
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Junior Member
Joined: Apr 2002
Posts: 8
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From: illinois
clunking noise
hey guys new here......was curious if any one knows...i have a 1998 F-150 4.6L Ext. Cab and everytime i put it in gear i hear a clunking noise....what is that or what could that be?
Senior Member
Joined: Sep 2000
Posts: 1,704
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From: Mpls, MN
If you can hear it coming from right underneath you, it is probably the u-joints or the slip yoke. The u-joints cannot be greased so they may be dried an frozen or loose and worn. The slip yoke splines also need to be lubed. I found this out when I changed my u-joints a few weeks ago. After I reinstalled the driveshaft, I heard a click or clunk whenever I went into reverse or drive.
The slip yoke splines connect to the transmisison output shaft and need to have a certain amount of grease. Ford has a special teflon grease for this and it actually works very well. Ford P/N::D2AZ-19590-A. It's $23.40 for a one pound can but it does the job.
If this isn't it then it would be the differential, but don't get too concerned yet.
The slip yoke splines connect to the transmisison output shaft and need to have a certain amount of grease. Ford has a special teflon grease for this and it actually works very well. Ford P/N::D2AZ-19590-A. It's $23.40 for a one pound can but it does the job.
If this isn't it then it would be the differential, but don't get too concerned yet.
Last edited by AjRagno; Apr 24, 2002 at 03:34 PM.
Senior Member
Joined: Mar 2001
Posts: 865
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From: South Dakota
Originally posted by AjRagno
If you can hear it coming from right underneath you, it is probably the u-joints or the slip yoke. The u-joints cannot be greased so they may be dried an frozen or loose and worn. The slip yoke splines also need to be lubed. I found this out when I changed my u-joints a few weeks ago. After I reinstalled the driveshaft, I heard a click or clunk whenever I went into reverse or drive.
The slip yoke splines connect to the transmisison output shaft and need to have a certain amount of grease. Ford has a special teflon grease for this and it actually works very well. Ford P/N:
2AZ-19590-A. It's $23.40 for a one pound can but it does the job.
If this isn't it then it would be the differential, but don't get too concerned yet.
If you can hear it coming from right underneath you, it is probably the u-joints or the slip yoke. The u-joints cannot be greased so they may be dried an frozen or loose and worn. The slip yoke splines also need to be lubed. I found this out when I changed my u-joints a few weeks ago. After I reinstalled the driveshaft, I heard a click or clunk whenever I went into reverse or drive.
The slip yoke splines connect to the transmisison output shaft and need to have a certain amount of grease. Ford has a special teflon grease for this and it actually works very well. Ford P/N:
2AZ-19590-A. It's $23.40 for a one pound can but it does the job.If this isn't it then it would be the differential, but don't get too concerned yet.
Senior Member
Joined: Sep 2000
Posts: 1,704
Likes: 0
From: Mpls, MN
A bad slip yoke would cause a clunk but wouldn't shutter. Not in theory at least.
It sounds to me more like a rear differential issue.
Since you have a limited-slip, it may not have had the friction modifier added when it left the factory. This is probably a good place to start.
I can't understand why a new truck would feel like this. It's really too bad.
I would say if your dealer isn't listening to you about it or doesn't have an answer, sssshhhh......break it by exacerbating the vibration as best you can........
If you search under "shutter" in the Other Drivetrain forum, there are many examples.
Since you have a limited-slip, it may not have had the friction modifier added when it left the factory. This is probably a good place to start.
I can't understand why a new truck would feel like this. It's really too bad.
I would say if your dealer isn't listening to you about it or doesn't have an answer, sssshhhh......break it by exacerbating the vibration as best you can........
If you search under "shutter" in the Other Drivetrain forum, there are many examples.
Senior Member
Joined: Mar 2001
Posts: 865
Likes: 0
From: South Dakota
Re: A bad slip yoke would cause a clunk but wouldn't shutter. Not in theory at least.
Originally posted by AjRagno
It sounds to me more like a rear differential issue.
Since you have a limited-slip, it may not have had the friction modifier added when it left the factory. This is probably a good place to start.
I can't understand why a new truck would feel like this. It's really too bad.
I would say if your dealer isn't listening to you about it or doesn't have an answer, sssshhhh......break it by exacerbating the vibration as best you can........
If you search under "shutter" in the Other Drivetrain forum, there are many examples.
It sounds to me more like a rear differential issue.
Since you have a limited-slip, it may not have had the friction modifier added when it left the factory. This is probably a good place to start.
I can't understand why a new truck would feel like this. It's really too bad.
I would say if your dealer isn't listening to you about it or doesn't have an answer, sssshhhh......break it by exacerbating the vibration as best you can........
If you search under "shutter" in the Other Drivetrain forum, there are many examples.
however, i don't think rear end is making the shudder type sensation i get while coming up to or pulling away from a stop. my open diff 99 ranger did the same thing until the local shop replaced the driveshaft. the fixed it for awhile but the shudder came back just as i was giving the truck back to ford off lease.
anyhoo, the main reason i asked about the slip yoke splines was because my dad had something similar lubed on his gmc truck and it got rid of a shudder he was experiencing...
btw, nice advice on what to do about the vibration (ie...break something)!