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post #1 of 9 Old 06-29-2019, 04:13 PM Thread Starter
Jrgarren88
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91 dakota vibration

Hey everyone, I bought a 91 2wd 3.9 dakota with 67ΧΧΧ miles recently and I'm having some trouble out of it. 1st of let me start by saying I haven't had it long and it's not a daily driver so I've not fooled with it hardly at all. But what's going on is at 35-75 mph it has a hard vibration in the front end you can see it vibrating inside and also looking at the hood, and feel it bad in the steering wheel. If you let off the gas or put it neutral it completely goes away and acts the worse (in the sweet spot) while accelerating. Not sure what's going on and haven't found anthing on any site I've checked so far, so any info would be appreciated. Thanks in advance.
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post #2 of 9 Old 06-29-2019, 10:22 PM
RalphP
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I would check the "usual suspects" first ...

U joints, front and rear.

Motor mounts.

Transmission mounts.

RwP
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post #3 of 9 Old 07-05-2019, 07:30 AM Thread Starter
Jrgarren88
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Checked the U joints, not thinking that's the problem. No clunking sound and very little play. It could possibly be it mounts, I'm going to check them better with some help from someone. When I checked them there was movement from gear to gear. Didn't see a whole lot doing a hard brake test. But didn't get in to it good. Thinking of taking the hood off and taking around the block a few times to get it to the right speed. Thanks again.
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post #4 of 9 Old 07-09-2019, 08:34 PM
John's Dakota
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The mounts have a safety design that keeps them from moving a lot. If bad they will move quickly to their limited maximum and drop down when you let off. Do this stationary. Then try reverse to check the right side mount.
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post #5 of 9 Old 07-09-2019, 09:23 PM
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Well if it 2wd as you say then there aren’t any front u-joints, does it seem to be corresponding to engine speed rather than vehicle speed? Since it stops when you put it in neutral maybe because you let the engine slow down at the same time. We need some testing and reporting back on that first.
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post #6 of 9 Old 07-10-2019, 07:17 AM Thread Starter
Jrgarren88
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Originally Posted by John's Dakota View Post
The mounts have a safety design that keeps them from moving a lot. If bad they will move quickly to their limited maximum and drop down when you let off. Do this stationary. Then try reverse to check the right side mount.
That's seems to be what it's doing when doing a hard brake in drive test. And as I said when I'm stationary and go from drive to reverse. I haven't done a hard brake test in reverse though.
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post #7 of 9 Old 07-10-2019, 07:22 AM Thread Starter
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Originally Posted by aircommuter View Post
Well if it 2wd as you say then there aren’t any front u-joints, does it seem to be corresponding to engine speed rather than vehicle speed? Since it stops when you put it in neutral maybe because you let the engine slow down at the same time. We need some testing and reporting back on that first.
Yes, to me it seems to be engine speed. Because like I said I could be driving and feel heavy vibration and let off the gas and there is no vibration, but as soon as get back in it then vibration is there.
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post #8 of 9 Old 07-11-2019, 06:46 PM
RalphP
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Quote:
Originally Posted by aircommuter View Post
Well if it 2wd as you say then there aren’t any front u-joints, does it seem to be corresponding to engine speed rather than vehicle speed? Since it stops when you put it in neutral maybe because you let the engine slow down at the same time. We need some testing and reporting back on that first.
There IS a U-joint on the front end of the driveshaft, known as the front U-joint.

RwP
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post #9 of 9 Old 07-11-2019, 07:12 PM
aircommuter
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Really! Read the the post it says the vibration is in the front end of the vehicle. The front ujoint is still on the rear driveshaft, not in the front end.
I still say to diagnose the vibration without having the vehicle to feel it yourself or myself we need to know if it is engine speed, driveshaft speed or wheel speed. This is how a diagnosis eliminates the possible components.
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