Death shake
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New User
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Death shake
I have a 99 7.3 and when Im going between 65 and 70 every once and and a while it will start shaking in the back, I have had new tires put on checked u joints shocks and everything else I can think of but cant figure it out, it does not do it all the time and it does not do it with a load. Any help would be appreciated
Laughing Gas
Joined: Nov 2010
Posts: 1,159
Likes: 33
From: Utah
If it is speed related, it is likely a problem with the tire or wheel assembly. A friend just put OEM size nitto terra grapplers on his 2017 F250 and had bad shaking etc. Tire shop claimed his OEM wheels were faulty. BS. He took it to Ford, they re balanced all wheels and rotated. Still shook. He went back to the shop and made them take the tires back and replace with Michelins. Problem gone.
Tires do get manufactured out of round and too far out of balance.
Tires do get manufactured out of round and too far out of balance.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
Likes: 1,335
From: Elk Grove, CA
Does your E brake work well? A leaking rear axle seal can contaminate the E brake shoes, and then they won't work well. I could see grungy shoes getting grabby if they get hot and cook off.
Just a guess.
Just a guess.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
Not claiming to have your answer but the previous owner of one of my pickups must have slid into a curb sideways pretty hard once. I was chasing an intermittent tire-speed shake in the rear at highway speeds for a long time; rebalances, rotations, different sets of wheels/tires. I finally put the rear on jacks, removed the wheels, and ran the thing in drive just to see the rotor on the right rear wobbling ever so slightly. The WHOLE wheel mounting surface was experiencing runout. I removed the rotor and ran it again and found that the hub was running true but the actual wheel mounting flange was bent. I replaced the hub with a wrecking yard part from ebay and my problem went away.
A minute amount of runout at the center of the wheel mounting surface equals a lot of movement at the tread surface.
Again, not saying it's your problem but to hint that it could be a lot of things.
A minute amount of runout at the center of the wheel mounting surface equals a lot of movement at the tread surface.
Again, not saying it's your problem but to hint that it could be a lot of things.
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New User
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havnt tried the e brake so I dont know if it does or not
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Thread Starter
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New User
Joined: Jan 2020
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Not claiming to have your answer but the previous owner of one of my pickups must have slid into a curb sideways pretty hard once. I was chasing an intermittent tire-speed shake in the rear at highway speeds for a long time; rebalances, rotations, different sets of wheels/tires. I finally put the rear on jacks, removed the wheels, and ran the thing in drive just to see the rotor on the right rear wobbling ever so slightly. The WHOLE wheel mounting surface was experiencing runout. I removed the rotor and ran it again and found that the hub was running true but the actual wheel mounting flange was bent. I replaced the hub with a wrecking yard part from ebay and my problem went away.
A minute amount of runout at the center of the wheel mounting surface equals a lot of movement at the tread surface.
Again, not saying it's your problem but to hint that it could be a lot of things.
A minute amount of runout at the center of the wheel mounting surface equals a lot of movement at the tread surface.
Again, not saying it's your problem but to hint that it could be a lot of things.
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no its not lifted
Butt-Head
Joined: Apr 2004
Posts: 9,448
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From: Reed Point, MT
It did. But it would come and go every few hundred yards and shorter distances around corners (intermittent) and I'll guess that it had to with timing of the left rear tire and any little imbalance it may have had or slight runout in the other wheel. It wasn't horrible but it was annoying.
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New User
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It did. But it would come and go every few hundred yards and shorter distances around corners (intermittent) and I'll guess that it had to with timing of the left rear tire and any little imbalance it may have had or slight runout in the other wheel. It wasn't horrible but it was annoying.
Fleet Mechanic
Joined: Sep 2011
Posts: 1,613
Likes: 106
From: Albuquerque
I get a lot of truck shake on segmented freeways, the length of the truck hits just right at certain speeds to cause it! I have to either speed up or slow down to stop it, prefer to speed up!