Weird vibration just started
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Weird vibration just started
SO, have a 72 F-100. 360, SWB, 4x4. Runs really well over the past couple of years with the exception of the infamous rear seal oil leak (the my wife sayls (your truck is crying)).
Anyway, have never had a problem with much of anything over the past few years. Accelerates fine, drives great from 0-70 (although I rarely drive it 70---normally never over 65.
Recently I noticed that I have a vibration that has started.
Truck drives great until I hit about 35-36 mph. At that point it begins a small vibration that gets greater the faster you go up until about 55. At 55 the vibration backs of a bit to about 75% less than the peak vibration. Still a bit of a vibration.
At any point, if I take my foot off the accelerator, the vibration immediately stops. Press the accelerator again, and it starts back up again, right where it left off.
I have done zero mods to it over the past couple of years....no off roading...nothing.
Kind of scratching my head...kind of hard to look under the undercarriage at 40 mph...
Any suggestions?
Anyway, have never had a problem with much of anything over the past few years. Accelerates fine, drives great from 0-70 (although I rarely drive it 70---normally never over 65.
Recently I noticed that I have a vibration that has started.
Truck drives great until I hit about 35-36 mph. At that point it begins a small vibration that gets greater the faster you go up until about 55. At 55 the vibration backs of a bit to about 75% less than the peak vibration. Still a bit of a vibration.
At any point, if I take my foot off the accelerator, the vibration immediately stops. Press the accelerator again, and it starts back up again, right where it left off.
I have done zero mods to it over the past couple of years....no off roading...nothing.
Kind of scratching my head...kind of hard to look under the undercarriage at 40 mph...
Any suggestions?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Check the engine and transmission mounts. Use a jack and length of 2x4 to determine whether the metal and rubber interface has separated.
And while under there, do a bumper to bumper visual check and snug up various nuts and bolts.
... perhaps more obvious is did ya lose a wheel weight and thus causing an imbalance?
Road test and post back your results.
And while under there, do a bumper to bumper visual check and snug up various nuts and bolts.
... perhaps more obvious is did ya lose a wheel weight and thus causing an imbalance?
Road test and post back your results.
Cargo Master
Joined: Jan 2016
Posts: 2,671
Likes: 372
Check everything already mentioned and if you still have vibration, consider new shocks. I've had similar experience on a 2002 3/4 ton and a '96 ranger. After checking/replacing the usual, it turned out to be worn shocks.
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And the winner is....
U-joints...
Took a couple of pics to show, but they will not load properly for some reason. Everything looked fine as I was pulling them apart. Got to the last cap on the second u-joint and basically it was halfway gone. I am saying another 20-30 miles and I would have dropped a drive shaft. $42,00 later and I am cruising likely.
Thanks for confirming my suspicions.
Took a couple of pics to show, but they will not load properly for some reason. Everything looked fine as I was pulling them apart. Got to the last cap on the second u-joint and basically it was halfway gone. I am saying another 20-30 miles and I would have dropped a drive shaft. $42,00 later and I am cruising likely.
Thanks for confirming my suspicions.
Thread Starter
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New User
Joined: Oct 2017
Posts: 3
Likes: 0
And the winner is....
U-joints...
Took a couple of pics to show, but they will not load properly for some reason. Everything looked fine as I was pulling them apart. Got to the last cap on the second u-joint and basically it was halfway gone. I am saying another 20-30 miles and I would have dropped a drive shaft. $42,00 later and I am cruising nicely.
Thanks for confirming my suspicions.
Took a couple of pics to show, but they will not load properly for some reason. Everything looked fine as I was pulling them apart. Got to the last cap on the second u-joint and basically it was halfway gone. I am saying another 20-30 miles and I would have dropped a drive shaft. $42,00 later and I am cruising nicely.
Thanks for confirming my suspicions.
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Jan 13, 2004 02:47 PM