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Vibration in 4 wheel drive

Old 02-10-2019, 06:23 AM
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Vibration in 4 wheel drive

My 1990 has some vibration in 4 wheel drive high, She is all stock except recalls for heads Toyota recalls and a fer other recalls. A transmission with 111,000 miles put in 3 years ago. 199,089 on the clock now, No vibrations when driving at any speed in 2 wheel drive.She has been well taken care. Everything works except the vibration. It is slight and seems the whole vehicle not just the steering wheel, She is has a automatic.. Any help would be appreciated.
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Old 02-10-2019, 06:38 AM
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Certain speeds ?
might help to describe a bit more what the symptoms are...
my first inclination would be u joints...

Last edited by 87-4runner; 02-10-2019 at 06:40 AM.
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Old 02-10-2019, 06:51 AM
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Driving on pavement? I would expect some vibration as you are tearing up the tires.
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Old 02-10-2019, 07:53 AM
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It is slow on pavement 20 mph or less. I just do it for two miles through a straight neighbor hood going to the grocery store. Once a week or so just to put some miles on 4 wheel high. Hard to describe it is a hum. Like you would get with an exhaust that messes with you at a certain speed and rpm. Michelin M/S dry rot rot before i need to change 31-10-50 R15. CVT boots like new. No leaks. Axles have only the slightest movementt when I shake the hell out of them. I get the part about no 4 wheel drive engaged on dry pavement. I new it was bad turning but slow a straight. I will take your advice.
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Old 02-10-2019, 08:09 AM
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Will have the U Joints gone over .......
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Old 02-10-2019, 08:41 AM
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Originally Posted by bucketofguts View Post
Will have the U Joints gone over .......
that slow it's probably not u joints but won't hurt to check them...
I'd probably put mine on blocks... put it in 4 wheel high and try to isolate where it's coming from...
trans, differential, transfer case?
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Old 02-11-2019, 08:51 AM
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I get something similar, just posted din another thread, but my LBJ have excessive play and my drivers side hub needs a repack (possible replace not sure yet). I'm waiting on some parts to do the work but I'll post back if you haven't figured it out yet.

My symptoms: Vibration in 4wd when getting above 30-35 on snow covered roads, increased under acceleration. From what I can tell the u-joints on the front shaft are fine and I don't get it in 2wd.
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