Undercarriage clunk while accelerating/shifting gears?
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Mountain Pass
Joined: Sep 2021
Posts: 128
Likes: 10
Undercarriage clunk while accelerating/shifting gears?
01 f-250 crew cab 4x4 7.3
Pretty straightforward problem, just not too sure where to start. Also don't have another set of eyes to help me out.
The other day I was driving around 45mph, took my foot off the gas, pressed the gas and heard a clunk towards the rear end. Repeated it and it continued to clunk every time I applied the gas. While shifting from Park to Drive there has been a distinct clunk, or park to reverse. Driving has not been hindered, the truck doesn't shake or anything hindering drivability. I figured it had something to do with the driveshaft or joints, however i have never experienced any of these issues before! I cant visibly tell that anything is wrong by looking at it so any insight on this is greatly appreaicated
Pretty straightforward problem, just not too sure where to start. Also don't have another set of eyes to help me out.
The other day I was driving around 45mph, took my foot off the gas, pressed the gas and heard a clunk towards the rear end. Repeated it and it continued to clunk every time I applied the gas. While shifting from Park to Drive there has been a distinct clunk, or park to reverse. Driving has not been hindered, the truck doesn't shake or anything hindering drivability. I figured it had something to do with the driveshaft or joints, however i have never experienced any of these issues before! I cant visibly tell that anything is wrong by looking at it so any insight on this is greatly appreaicated
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
You'll need to park the truck on flat level ground and chock the wheels so she can't roll over you and kill you. Then put the truck in neutral and crawl under the truck to one of the u joints and try to move it. Push, pull, twist, and shake each and every one in the line. You shouldn't see or feel any play or movement between one shaft section and the other, none. If you find anything moving when it shouldn't or vise versa then the joint is bad and needs replaced. Also inspect the carrier bearing that suspends the shaft about midway between the transmission/transfer case and the rear end. Oh and the slip yokes have a slight reputation for wearing out too.
Thread Starter
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Mountain Pass
Joined: Sep 2021
Posts: 128
Likes: 10
You'll need to park the truck on flat level ground and chock the wheels so she can't roll over you and kill you. Then put the truck in neutral and crawl under the truck to one of the u joints and try to move it. Push, pull, twist, and shake each and every one in the line. You shouldn't see or feel any play or movement between one shaft section and the other, none. If you find anything moving when it shouldn't or vise versa then the joint is bad and needs replaced. Also inspect the carrier bearing that suspends the shaft about midway between the transmission/transfer case and the rear end. Oh and the slip yokes have a slight reputation for wearing out too.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
The carrier bearing is rubber mounted so it will move some. What you're looking for there is signs of age and wear to the rubber bushing and excess play or binding in the actual bearing itself.
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Mountain Pass
Joined: Sep 2021
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Lead Driver
Joined: Dec 2006
Posts: 7,092
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From: San Diego, CA
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Mountain Pass
Joined: Sep 2021
Posts: 128
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Hm, Ill have to look into that too. It stopped making the noise so far but ill be sure to let yall know what happens/what i find for future reference.
Appreciate the response
Appreciate the response
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Lead Driver
Joined: Dec 2006
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From: San Diego, CA
I did notice a difference between other greases I used and the Ford grease on the slip yoke (IIRC Motorcraft XG-8?). The Motorcraft application would last considerably longer before I would have to do it again.
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Mountain Pass
Joined: Sep 2021
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hey man, I finally got around to getting under the truck. The carrier bearing does have play, in all directions. It’s old and corroded, some rust on there too. Nowhere else on the driveshaft does it have rotational play, or up/down/left/right play. So you think a carrier bearing job would work?
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