Vibration between 35-40 mph
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Vibration between 35-40 mph
Hey everyone,
I can't figure out what's going on. My truck rides smooth all except right between 35 and 40 mph. When I'm in that zone it shakes like there is a major wheel imbalance issue. It happens every time no matter what, regardless of if it's under a load or not. I've had the tires balanced and the alignment done. I had them re-check the balance just because it was still there and they assured me the tires were round, no bubbles, and balanced. I just don't know where to go from here? Is there a possibility that this could be a driveshaft imbalance issue where a weight fell off maybe? The driveshaft carrier bearing looks good (rubber intact and very little play) and the u joints appear to be good with no play... could probably still be bad.
I can't figure out what's going on. My truck rides smooth all except right between 35 and 40 mph. When I'm in that zone it shakes like there is a major wheel imbalance issue. It happens every time no matter what, regardless of if it's under a load or not. I've had the tires balanced and the alignment done. I had them re-check the balance just because it was still there and they assured me the tires were round, no bubbles, and balanced. I just don't know where to go from here? Is there a possibility that this could be a driveshaft imbalance issue where a weight fell off maybe? The driveshaft carrier bearing looks good (rubber intact and very little play) and the u joints appear to be good with no play... could probably still be bad.
Lead Driver
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Really hard to tell with such limited information, but tires can cause all sorts of problems if they go bad. I've had it happen .
When it starts this vibration what happens if you kick it in neutral and let it idle down ?
When it starts this vibration what happens if you kick it in neutral and let it idle down ?
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Great question on the neutral question. I totally forgot to do that earlier to isolate the driveshaft. When I just took it out real quick I got it to 37 mph, it started doing its shaking thing, I dropped it into neutral and the shake continued. I'm guessing that means it's not a driveshaft thing then being the driveshaft is no longer engaged once in neutral? Is there anything else I can do to check, once again, the tires? I mean I can take them back for a third time and really emphasize my concern or is there something I myself can do to dial it in that you know of? Thanks!
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From: Angier, NC
Great question on the neutral question. I totally forgot to do that earlier to isolate the driveshaft. When I just took it out real quick I got it to 37 mph, it started doing its shaking thing, I dropped it into neutral and the shake continued. I'm guessing that means it's not a driveshaft thing then being the driveshaft is no longer engaged once in neutral? Is there anything else I can do to check, once again, the tires? I mean I can take them back for a third time and really emphasize my concern or is there something I myself can do to dial it in that you know of? Thanks!
If you have checked the wheels 2 or 3 times and the suspension front & rear a few times also and are sure it is not them, how old are the shocks?
I would pull the drive shaft and check each Ujoint and the carrier bearing. A little play any where in the drive shaft is not good.
I almost forgot check the trans mount. Is it oil soaked or cracked? Motor mounts to when checking.
Dave ----
Tuned
Joined: Jan 2016
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With the truck off, lay down in front of it and have someone go in and rock the steering wheel back and forth and observe:
- tie-rod frame and axle mounts
- tie rod bushings
- driver's side frame rail
- steering box mount
- drag-link
My guess is your tie-rod bushings and axle-mount are worn-out, possibly cracked frame under the steering box where it mounts.
- tie-rod frame and axle mounts
- tie rod bushings
- driver's side frame rail
- steering box mount
- drag-link
My guess is your tie-rod bushings and axle-mount are worn-out, possibly cracked frame under the steering box where it mounts.
Lead Driver
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Putting it in neutral eliminates any engine or related problems as well as some in the transmission .
Normally a u joint that bad is going to be obvious if you checked them good. if the driveshaft was okay before not likely it changed.
Tires or something in the drive axle would be my first guesses . when a tire separates it can cause the symptoms you described.
Normally a u joint that bad is going to be obvious if you checked them good. if the driveshaft was okay before not likely it changed.
Tires or something in the drive axle would be my first guesses . when a tire separates it can cause the symptoms you described.
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From: Angier, NC
I just saw this over in the drive train area
https://www.ford-trucks.com/forums/1...ibrations.html
Points to drive shaft issue
Dave ----
https://www.ford-trucks.com/forums/1...ibrations.html
Points to drive shaft issue
Dave ----
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Thanks so much everyone! A wealth of knowledge! This weekend I'll see what I can figure out by applying everything you all mentioned. Hopefully it becomes obvious as I work through the list of items to inspect. I'll keep you posted on what I find. 