Whine noise.. U Joints? - Mustang Evolution

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Old 04-22-2016, 12:22 AM   #1
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Whine noise.. U Joints?

I have a 2004 Mustang gt that whines and vibrates at high speeds. It sometimes whines at low speeds but never when I accelerate. When I am going about 50-70 MPH sometimes it clunks and slows my car down it feels like. I am actually replacing the U-joints tomorrow but I was just wondering if anyone else had this problem. I'm just making sure I am looking in the right direction. Thanks!
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Old 04-22-2016, 11:11 AM   #2
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Are you sure that the noise is suspension? How long has it been since you got an alignment? It could also be a transmission issue.
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Old 04-22-2016, 01:32 PM   #3
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Welcome to the club of New Edge whiners. My 02 has a supercharger whine that I think is a throw out or pilot bearing. When I press the clutch in the noise goes away.

If you have clunks and whines I would suggest that you check the rear end for play. I would possibly go so far as to say it could be helpful to drain the differential fluid and inspect for metal flakes. Then pull the diff cover and and make sure none of the gears are cracked or destroyed.

Our cars are beginning to show their age a bit. They require a little love and care.

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Old 04-22-2016, 01:42 PM   #4
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I know that if the differential has clearance issues, that they will whine noticeably, and that the whine sometimes goes away if you accelerate, as this puts pressure on the gears from a different direction...........I also know that if a u-joint is going bad, that they will clunk when the lash from one side gets taken up by the other (like taking your foot off of the gas -- or when you first accelerate from a stop)..........but I don't think that u-joints whine.
You may be having an issue with both -- or one causing the other.
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Old 04-22-2016, 08:34 PM   #5
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I replaced the u joints and when I took the driveshaft out, I noticed that the driveshaft bolts were loose and then I seen that the pinion nut wasn't all the way tightened down and the flange was able to move when I grabbed it. I tightened the bolt down as tight as I could get it with a breaker bar. Now my car is jerking it seems when I go above 30 mph accelerating and when I am off the gas. When I parked it, it smelled like the grease I used to grease the u joints when I put them in. So now I'm on the next problem.. lol
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Old 04-22-2016, 08:36 PM   #6
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I'm clueless on answers for that one.

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Old 04-22-2016, 08:44 PM   #7
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I hope that everything is just "breaking in" from not being tightened and maybe the u-joints are getting their motion cause they were kind of stiff upon installation.
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Old 04-22-2016, 08:50 PM   #8
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It sounds like your pinion bearing is toast.
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Old 04-22-2016, 08:55 PM   #9
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I can just replace that bearing. would that be the reason it is jerking?
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Old 04-22-2016, 09:02 PM   #10
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That is likely the cause of the jerking.
The rear end will need to be inspected to determine if you can just replace the bearing, or if the damage is more extensive...
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Old 04-22-2016, 09:08 PM   #11
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I literally put a new axle in the car like 2 weeks ago. I think there was a little metal flake in the fluid but I thought it was just because the axle was bent. The gears all looked good. Ill have to check it out sometime next week. Hopefully all I need is a new crush sleeve and bearing.
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Old 04-22-2016, 09:51 PM   #12
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Quote:
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I literally put a new axle in the car like 2 weeks ago. I think there was a little metal flake in the fluid but I thought it was just because the axle was bent. The gears all looked good. Ill have to check it out sometime next week. Hopefully all I need is a new crush sleeve and bearing.
You are having the same kind of luck I am.

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Old 04-23-2016, 12:09 PM   #13
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I took it out this morning and realized that the vibration starts at exactly 45 MPH. It is smooth until then. could this be a sign of a bad pinion bearing still?
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Old 04-23-2016, 12:12 PM   #14
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I took it out this morning and realized that the vibration starts at exactly 45 MPH. It is smooth until then. could this be a sign of a bad pinion bearing still?
Are you hearing any noises?

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Old 04-23-2016, 12:48 PM   #15
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I do not hear any noises but it smells like the grease i used for the ujoints burning a little
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Old 04-23-2016, 12:54 PM   #16
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Can you see any gear oil leaking from around the pinion?
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Old 04-23-2016, 12:54 PM   #17
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Quote:
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I do not hear any noises but it smells like the grease i used for the ujoints burning a little
That's different. I can't say I have ever smelled grease after changing u joints on anything. Are you leaking fluid from the differential at the drive shaft?

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Old 04-23-2016, 01:11 PM   #18
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No leaking that i can tell. Is there anyway i couldve put the ujoints in wrong? I mean it looked like only one way to do it lol
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Old 04-23-2016, 01:16 PM   #19
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No leaking that i can tell. Is there anyway i couldve put the ujoints in wrong? I mean it looked like only one way to do it lol
I don't think you can mess up a u joint install. It's possible that the bearing on the input of your diff was messed up. Now while it's spinning the bearing is building excess heat due to friction. That could cause a burning grease smell and the vibration. That is my best guess at the moment.

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Old 04-23-2016, 01:18 PM   #20
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After you installed the u-joints in the drive shaft, could you move them back and forth with relative ease? They should have a little bit of resistance, being brand new, but they should move fairly easily.
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Old 04-23-2016, 01:33 PM   #21
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When you removed the drive shaft did you mark where the ds and the rear end meet if not the drive shaft could be unbalanced causing the vibration

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Old 04-23-2016, 01:36 PM   #22
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Be careful when you tighten that pinion nut because that nut adjusts your pinion bearing preload....too much and you will ruin your pinion bearing. I think it should have about 15 to 20 inch pounds
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Old 04-23-2016, 01:49 PM   #23
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I did not mark the driveshaft. How can i find the spot where it was balanced at? Would it help the excessive heat to the bearing (if that is it) to put friction modifier?
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Old 04-23-2016, 01:51 PM   #24
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Also the new u joints had a little resistance to them when i installed them
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Old 04-23-2016, 01:55 PM   #25
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MY VEHICLE VIBRATES AT 40MPH AND THEN GETS WORSE AT FREEWAY SPEEDS. WHY IS THIS HAPPENING?

There are any number of things that can cause a vehicle vibration. One of them is a driveshaft with worn out parts or a driveshaft that is out of balance. Determine where you are feeling the vibration, in the seat or in the steering wheel, and that will go a long way to determining where the vibration is coming originating



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Old 04-23-2016, 01:59 PM   #26
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It vibrates my seat, steering wheel and even my dash
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Old 04-23-2016, 02:00 PM   #27
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Unbolt the driveshaft and rotate it 180 degrees and revolt it see if it gets better are you manual or auto

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Old 04-23-2016, 02:06 PM   #28
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Auto
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Old 04-23-2016, 02:08 PM   #29
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Like FSTPUNKIN said, there is probably too much preload on the bearing now. Something must have gone wrong for the flange to have been loose. And large metal flakes in the gear oil is a bad sign.
I have the feeling that you are going to have to disassemble the rear to find out exactly what is going on.
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Old 04-23-2016, 03:47 PM   #30
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Im hoping that i dont have to do that. I wouldnt think it would be the pinion of it starts exactly at 45 moh would it? Even if i take off harder than usual, it is still smooth until 45. Ill be turning my drive shaft 180 probably tomorrow
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Old 04-23-2016, 04:50 PM   #31
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Try the drive shaft first easy doesn't cost nothing but your time and since your auto look at you trans mount mine was shot and caused vibration and clunks

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Old 04-23-2016, 05:17 PM   #32
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What do i look for on the trans mount?
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Old 04-23-2016, 05:28 PM   #33
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It still has its bushings mine were gone lol

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Old 04-23-2016, 05:31 PM   #34
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https://lmr.com/item/LRS-6068C/99-04...QveRoCqwHw_wcB
That's what it should look like

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Old 04-23-2016, 05:32 PM   #35
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It still has its bushings mine were gone lol

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You should have just bolted the motor and trans as a hard mount. Then you could have enjoyed the full effect of every cylinder. Lol

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