Foxbody Rear Differential Question - Mustang Evolution

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Old 04-10-2014, 06:49 PM   #1
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Foxbody Rear Differential Question

What is the brace called, that goes across the rear diff just past where the driveshaft connects? Should it be tight? I have a squeak coming from the rear end that I thought was u-joint, but the u-joint feels tight with no slack. I can wiggle that brace back and forth pretty easy, and don't know if that's normal.


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Old 04-10-2014, 10:10 PM   #2
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Quote:
Originally Posted by crroy71 View Post
What is the brace called, that goes across the rear diff just past where the driveshaft connects? Should it be tight? I have a squeak coming from the rear end that I thought was u-joint, but the u-joint feels tight with no slack. I can wiggle that brace back and forth pretty easy, and don't know if that's normal.


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I have the same problem , at least the noise , I thought it was my controll arm bushings but it may very well be that brace . Did you tighten yours yet? And did it fix the problem. I can only hear the squeek when I hit a bump with the Windows down

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Old 04-11-2014, 07:35 AM   #3
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I haven't tightened it yet, it has rubber bushings in it so I'm not sure how tight it's going to get. I drove the car to work this morning and noticed the squeak only happens when I apply the brakes. It's coming from the u-joint area. Maybe when I apply the brakes, that brace is allowing the differential to change angles a little and causing the u- joint to squeak? I had a Chevy truck that had bad u- joints, and this sounds just like that.


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Old 04-11-2014, 01:15 PM   #4
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You talking about the sway bar that connects to the lower control arms?
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Old 04-11-2014, 01:19 PM   #5
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No, this brace or whatever it is, cradles the front of the rear diff. Click image for larger version

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Old 04-11-2014, 01:21 PM   #6
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Ignore the arrows, it's the piece right in the middle of the pic.


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Old 04-12-2014, 08:48 AM   #7
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That's the axel damper or dog bone as most people call it. It is to dampen harmonics in the driveline.
Most people just remove it.
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Old 04-12-2014, 02:51 PM   #8
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Ok, thanks. That's probably not the source of my squeak then.


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Old 04-14-2014, 09:01 PM   #9
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Anyone know what else would make a squeaking sound, almost sounds like a scraping sound, in the rear? It's not like a suspension noise that happens every once on a while, it sounds like its in time with drive shaft or axle rotations, and only when I'm on the brakes. Maybe axle bearings?


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Old 04-14-2014, 09:03 PM   #10
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When is the last time you did the rear brakes?
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Old 04-14-2014, 09:06 PM   #11
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Three weeks ago, I replaced the brake cylinders, pads, drums, as well as all the springs and hardware.


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Old 04-15-2014, 06:33 AM   #12
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Well if it only happens when you get on the brakes, are you sure one of the drums is not boogered up or there is some other issue? Was this noise present before you did the rear drums or did it start showing up after?
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Old 04-15-2014, 09:30 AM   #13
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It was present before I rebuilt the brakes, I was hoping that would fix it, but no luck. I swear I think it's coming from the differential, but it's hard to tell. The u- joint has no slack at all in it.


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Old 04-17-2014, 12:41 AM   #14
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Check the fluid in the diff? I had too low of fluid in my different once and it whined anytime it was going over about 40

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Old 04-17-2014, 07:04 AM   #15
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I'm going to check that today.


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