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Old 08-26-2013, 09:19 PM   #1
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Bumping and grinding-HELP!!!

Today I went back home-about 2 hours away. I stopped by McDonald's to get breakfast. As I drove thru the drive thru I heard some bumping, and maybe some grinding(not much). Almost as if something was loose that is suppose to hold a moving part. The sound came from the rear part of the car. When I compressed the clutch, the bumping stopped. I'm lost, please help!
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Old 08-27-2013, 06:16 AM   #2
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Were you turning at the time of the noise, sound like could be the diff. Mine would make clunking noise, and would sound like something rubbing.
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Old 08-27-2013, 07:36 AM   #3
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Were you turning at the time of the noise, sound like could be the diff. Mine would make clunking noise, and would sound like something rubbing.
Yes! At a slow slow speed. Makes me feel like I need to grease something.
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Old 08-27-2013, 08:20 AM   #4
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Yes! At a slow slow speed. Makes me feel like I need to grease something.
May be worn control arms ..
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Old 08-27-2013, 09:15 AM   #5
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May be worn control arms ..
That was a thought. But it sounds like something rubbing. Like maybe a bracket or harness is loose.

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May be worn control arms ..
I did discover that my exhaust touches the control arm on the drivers side. Maybes a strange noise when it touches. But that's the sound I'm chasing.
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Old 08-30-2013, 06:30 AM   #6
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Jack her up and see if you have play in the rear end.
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Old 08-30-2013, 10:41 PM   #7
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I vote a LCA bushing
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Old 08-30-2013, 11:10 PM   #8
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Jack her up and see if you have play in the rear end.
I did. There is play, but it makes an awful sound.

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I vote a LCA bushing
Bushings are good.

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I think I'm going to change the fluid. Maybe it's worn or low.
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Old 09-01-2013, 08:39 AM   #9
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how much play, just a little bit is normal. If it seems excessive it probably is.
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Old 09-01-2013, 03:23 PM   #10
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how much play, just a little bit is normal. If it seems excessive it probably is.
It spins more than I thought it would. I was expecting some play, but it seems to turn more than just a little. And it sounds awful.
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Old 09-01-2013, 04:15 PM   #11
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"I don't see nothin' wrong... with a little bump 'n grind Baby"...

Sorry. I couldn't resist.

If you're talking about the movement when you turn the yoke on the differential, there should be some play when you spin it back and forth. It should not be excessively noisy though. If you hear a grinding noise, unfortunately, there is something wrong that an oil change won't fix.
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Old 09-01-2013, 04:32 PM   #12
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I thought about it after I checked the thread later. R Kelly in full effect. Nice!


Inside the car it sounds like grinding. When I jacked the car up and turned the driver side tire, I could not hear the grinding. It sounds like bumping and clunking.

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The reason I said something about changing the fluid is because it sound like fluid could correct it and I'm starting at the least expensive solution first. If not, I'll just upgrade the gears.
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Old 09-01-2013, 04:38 PM   #13
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For sure take the cover off and have a look. You're probably going to find metal shavings mixed in with all the gunk in the bottom of the diff...
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Old 09-01-2013, 11:07 PM   #14
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I'll do that and see what it looks like. Hopefully nothing too bad. I've been trying to decide which gears would best for me. I think I'm leaning toward the 3.73
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Old 09-02-2013, 10:53 AM   #15
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That's what I went with when I replaced my diff.
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Old 09-02-2013, 10:56 AM   #16
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U sure it wasn't the posi just clicking. It does that going around corners.
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Old 09-02-2013, 09:28 PM   #17
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U sure it wasn't the posi just clicking. It does that going around corners.
I've only heard it a few times. Going thru a drivethru and when I had it in the air.
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Old 09-02-2013, 09:37 PM   #18
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The title is so deceiving lol
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Old 09-03-2013, 06:22 AM   #19
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Mine would only make the noise once in a while. It happened when I would turn on an incline, going forward or in reverse. Had excess play in the rear when I jacked her up. It eventually started getting worse. So I put her in the shop.
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Old 09-03-2013, 09:58 PM   #20
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Mine would only make the noise once in a while. It happened when I would turn on an incline, going forward or in reverse. Had excess play in the rear when I jacked her up. It eventually started getting worse. So I put her in the shop.
What was the problem?

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The title is so deceiving lol
Ikr. I made the post and didn't think about it until I went back to it. I laughed out loud when I saw it.
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Old 09-04-2013, 11:33 AM   #21
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What was the problem?

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Ikr. I made the post and didn't think about it until I went back to it. I laughed out loud when I saw it.
The diff was shot.
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Old 09-05-2013, 06:22 AM   #22
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The diff was shot.
Hmmm. That's not the reply that I wanted to get.

How do I determine if its done? Other than the occasional bump and grind, it pulls like it should. Actually had to check it twice to see what gears wear in it-still stock 3.27.
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Old 09-05-2013, 07:14 AM   #23
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I asked on a couple forums what they thought. It came down to jacking it up checking for excess play in the rear end. Once I did that an seen how much play I had, there was no need for me to pull the cover off an look. I just took it to the shop.
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Old 09-05-2013, 07:16 AM   #24
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Hmmm. That's not the reply that I wanted to get.

How do I determine if its done? Other than the occasional bump and grind, it pulls like it should. Actually had to check it twice to see what gears wear in it-still stock 3.27.
Just get new gears , get 410s
Time to upgrade
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Old 09-05-2013, 08:43 AM   #25
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That's what I done, I figured if I was going to have the fix it might as well do it all. I went to 3.73, and had them replace everything except the axels.
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Old 09-05-2013, 09:28 PM   #26
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That's what I done, I figured if I was going to have the fix it might as well do it all. I went to 3.73, and had them replace everything except the axels.
Is this something that I can do? Replace everything?
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Old 09-06-2013, 06:56 AM   #27
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I am sure you can. There are ppl on here that have done it, I am sure. It was just out of my mechanical skills, plus I don't have very many tools, so it made more sense for me to take it to the shop then try to tackle it myself.
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Old 09-06-2013, 06:53 PM   #28
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I think I'll try it.
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