Ujoints or 4wd?
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Cross-Country
Joined: Nov 2018
Posts: 72
Likes: 16
From: FL
Ujoints or 4wd?
My 02 F250 w/117k 4wd has just started a knock at low speed turn associated with speed. I jacked up the front and checked both ujoints(replace the passenger side about month ago). All looked good with no noise or apparent sticking spinning the wheels while at full left or right. Jacked all 4 up and checked the auto hubs weren't engaging in 2wd. Ran it in 4wd hi and lo lock to lock with no noise or vibration. Any other checks that I can do?
Thread Starter
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Cross-Country
Joined: Nov 2018
Posts: 72
Likes: 16
From: FL
I have recently replaced the hub bearing assembly and axle seal on the driver side and the hub bearing, stub shaft and axle seal on the pass side while i was chasing a roaring sound. It only is happening loaded sharp left low speed turns.
Laughing Gas
Joined: Jan 2017
Posts: 1,216
Likes: 94
Recently had a friend w a similar problem every rotation it would bang turned out to be the u joint. I’d recommend getting someone else in the truck the jogging alongside 4-5 mph to hone in on the exact location.
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Cross-Country
Joined: Nov 2018
Posts: 72
Likes: 16
From: FL
So when I first checked it by spinning the front wheels, the front u joints spun. After several tests and head scratching my last check spinning the front wheels by hand did not spin the u joints. Did not think much of it until driving it and there is no clunking. It seems like the hubs engaged. Any troubleshooting or fixes for auto hubs engaging?
Thread Starter
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Cross-Country
Joined: Nov 2018
Posts: 72
Likes: 16
From: FL
So when I first checked it by spinning the front wheels, the front u joints spun. After several tests and head scratching my last check spinning the front wheels by hand did not spin the u joints. Did not think much of it until driving it and there is no clunking. It seems like the hubs engaged. Any troubleshooting or fixes for auto hubs engaging?
Laughing Gas
Joined: Apr 2007
Posts: 1,028
Likes: 3
From: Broad Run, Va
My guess is your front axle u-joints... get them replaced and I suggest the Dana Spicer non-greaseable...
the other thing to check might be your ball joints.. but that might be a long shot...
the other thing to check might be your ball joints.. but that might be a long shot...
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FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
Likes: 5,941
From: Lake Hartwell, GA
You can remove, clean and lubricate the auto locking hubs, but other than that they are replace as needed parts.
I suspect a failing U-joint as well. Sometimes the problem child can be difficult to find until the U-joint is in your hand.
Walking/jogging next to the truck is something I did when diagnosing a squeak when turning at low speed. It was much easier to pinpoint the noise from outside the vehicle.
You could rig up an action camera with a mic on it and affix it somewhere where you can film and record sound for the noise area. I did this with my Samsung S7 when diagnosing clutch chatter. I filmed the driveshaft and rear axle to nail it down.
Keep us updated.
I suspect a failing U-joint as well. Sometimes the problem child can be difficult to find until the U-joint is in your hand.
Walking/jogging next to the truck is something I did when diagnosing a squeak when turning at low speed. It was much easier to pinpoint the noise from outside the vehicle.
You could rig up an action camera with a mic on it and affix it somewhere where you can film and record sound for the noise area. I did this with my Samsung S7 when diagnosing clutch chatter. I filmed the driveshaft and rear axle to nail it down.
Keep us updated.
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From: Los Angeles, Ca.
I've always been able to detect a bad U-joint, I thought it was impossible to not be able to see/feel play in one. Just over a week ago I replaced one that seemed a little bit sloppy but was making a terrible clunk and screech that seemed inconsistent with the small amount of play it had. After removing the shaft it became apparent that it was a bit worse than it first seemed. When I pressed it out....holy crap! The needles were all missing from one cup, the cup was cracked around the edge, and the 'peg' that sits inside the cup was almost 1/4 gone almost D shaped.
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