Vibration
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Senior User
Joined: May 2007
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From: Everett, WA
Vibration
I have a '70 F-100 with a C4 and a 9". It has developed (or has always had without my notice) a vibration at around 65mph (I do not drive the truck on the highway very often, which is how it would have escaped my notice until recently). The wheels are balanced, the driveshaft is balanced and has new u-joints and carrier bearing but the vibration persists. I feel it in the wheel but it also seems to shake the whole truck, I am going to have someone drive next to me and see if there is any obvious wobble. Other than that, any ideas where to look next? Perhaps a loose/worn component in the steering? Rear end? Thanks in advance for any and all help.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
I have a '70 F-100 with a C4 and a 9". It has developed (or has always had without my notice) a vibration at around 65mph (I do not drive the truck on the highway very often, which is how it would have escaped my notice until recently). The wheels are balanced, the driveshaft is balanced and has new u-joints and carrier bearing but the vibration persists. I feel it in the wheel but it also seems to shake the whole truck, I am going to have someone drive next to me and see if there is any obvious wobble. Other than that, any ideas where to look next? Perhaps a loose/worn component in the steering? Rear end? Thanks in advance for any and all help.
1. belt separation in one of the tires. (air pocket lump in tread or sidewall)
2. loose lug nuts
3. loose wheel bearings
4. bad front shocks. front tires actually bouncing while you are driving
5. since you feel it more in the STEERING WHEEL the problem should be from the front. Just in case, a bent rear axle can cause it.
BTW GO SUN DEVILS!
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Senior User
Joined: May 2007
Posts: 218
Likes: 1
From: Everett, WA
Check these:
1. belt separation in one of the tires. (air pocket lump in tread or sidewall)
2. loose lug nuts
3. loose wheel bearings
4. bad front shocks. front tires actually bouncing while you are driving
5. since you feel it more in the STEERING WHEEL the problem should be from the front. Just in case, a bent rear axle can cause it.
1. belt separation in one of the tires. (air pocket lump in tread or sidewall)
2. loose lug nuts
3. loose wheel bearings
4. bad front shocks. front tires actually bouncing while you are driving
5. since you feel it more in the STEERING WHEEL the problem should be from the front. Just in case, a bent rear axle can cause it.
Everyone is entitled to their opinion...even if it's wrong
Believe Nothing
Joined: Jun 2004
Posts: 7,513
Likes: 394
From: W. Central FL.
Some of these series trucks had a cast iron plate attached to the rear of the cab as a vibration damper. I may be off on the years a bit but I remember seeing it on one of my trucks back when. And thinking about vibrations, is your C4 equipped with the add on vibration damper ? Some have it, some do not.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
I would still check 1 through 3. Once I bought a set of Goodyears to put on a car I was turning. I just happened to look at one of them before they were getting mounted and notice a sidewall looked wierd. On closer inspection I found a hole in the inner belts about the size of a half dollar! The only thing that was there was the inner and outer layer of rubber. As far as the lug nuts goes, the tech who mounted the tires is human. And if he re-packed the bearings I repeat, he's human.
The linkage? That usually causes a "wander" or grabbing any crack in the road. Not usually a vibration.
The linkage? That usually causes a "wander" or grabbing any crack in the road. Not usually a vibration.
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