Vibration under load
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4wd Low
Joined: Dec 2024
Posts: 12
Likes: 2
Vibration under load
My 1993 f150 has a vibration that feels like it’s coming from under the seat, possibly further back, when I accelerate at any speed usually going up a hill but sometimes on flat ground. Any ideas what it could be? Wheels unbalanced? I can accelerate on flat ground at high speeds above 60mph and it’s non existent.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Could be the carrier bearing if it has a 2-pc driveshaft, could also be dried out U joints in the driveshaft. The driveshaft has to be removed to inspect for these issues, it's not good enough to simply shake it looking for movement.
Hotshot
Joined: Jul 2020
Posts: 10,315
Likes: 2,579
From: Near Salt Lake City
To check the u joints you jack the truck up and put it in neutral on jackstands or a hoist
Then roll the driveline(s) over, back and forth looking for any looseness or movement in the u joints
In your case while rthe truck is jacked up and you are checking the u joints, check the rear axle pinion for being loose on the rear end
That is common, when the pinion bearings get worn, the rear yoke will be loose on the pinion gear
Then roll the driveline(s) over, back and forth looking for any looseness or movement in the u joints
In your case while rthe truck is jacked up and you are checking the u joints, check the rear axle pinion for being loose on the rear end
That is common, when the pinion bearings get worn, the rear yoke will be loose on the pinion gear
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