Rear end grind - Mustang Evolution

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Old 04-23-2015, 09:49 PM   #1
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Rear end grind

I've noticed sometimes I hear a faint grinding noise which I think is from the rear end. I can also feel it a little in the floorboard. It's so quiet it's hard to hear but when I can hear it it's at a slow speed with clutch in (~30mph) (exhaust makes it hard to hear so coasting is only time j hear it) it's like loud quiet loud quiet type sound like something's dragging unevenly. But like I said it's a dull grinding noise not really like metal to metal which would be high pitch I would think. Any ideas? Also my car is noticeably slower in the lower rpms like something is holding it back. Idk maybe it's the same problem? Thanks for any help


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Old 04-23-2015, 09:51 PM   #2
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Also it's never gotten worse. Every time I notice it it's the same


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Old 04-23-2015, 11:13 PM   #3
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My car does the same thing while coasting, in gear, with the clutch disengaged. I notice it most when going through a fast-food drive-thru.
It doesn't seem to make any noise when coasting with the transmission in neutral.
I'm pretty sure that it is the transmission that is making the noise but I'm not too concerned about it because I don't often coast with the clutch depressed, and the transmission in gear.
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Old 04-23-2015, 11:22 PM   #4
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Mine does it outa gear too so maybe u joints or a bearing on the rear idk


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---------- Post added at 12:22 AM ---------- Previous post was at 12:22 AM ----------

In*


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Old 04-23-2015, 11:25 PM   #5
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It does it both in and out of gear?
Whether the clutch is depressed or not?
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Old 04-23-2015, 11:39 PM   #6
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mine is also doing the same thing. I am positive it is the bearing. it almost sounds like a plane lol. My friend that is a ford mechanic said its the bearings too. so i am going to replace them on sunday. I will keep you posted if the sound goes away. I just hope its not something else like the differential.
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Old 04-24-2015, 02:06 AM   #7
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Yea both in or out. Hardly ever brake dust in the back so it's gotta a beating or u joint, I changed oil in dif not long ago when it made a horrible racket while turning. That fixed that but this is a different noise/rumble/vibration idk it's s strange sound but speed related and very faint


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Old 04-24-2015, 06:15 AM   #8
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which oil weight did you use?
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Old 04-24-2015, 11:44 AM   #9
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Whatever it said on the tag on the dif. I can't remember at the moment


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Old 04-24-2015, 11:53 AM   #10
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ok then 75-140 should be in there. otherwise, maybe add the friction modifier.

reason i asked was because a buddy of mine told me ford switched to thicker oil to quiet it down.
i have no idea if its true or not.
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Old 04-24-2015, 01:25 PM   #11
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Originally Posted by Calebnc302 View Post
Yea both in or out. Hardly ever brake dust in the back so it's gotta a beating or u joint, I changed oil in dif not long ago when it made a horrible racket while turning. That fixed that but this is a different noise/rumble/vibration idk it's s strange sound but speed related and very faint


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In that case, you should put the rear end on jack stands and see if you can isolate the source of the noise.
When I bought my car, it had a bad axle bearing that produced a low rumbling noise that was most noticeable at lower speeds
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Old 04-24-2015, 09:31 PM   #12
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In that case, you should put the rear end on jack stands and see if you can isolate the source of the noise.

When I bought my car, it had a bad axle bearing that produced a low rumbling noise that was most noticeable at lower speeds

K thanks. I'll try that tmrw


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