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Old 02-25-2011, 08:35 PM   #1
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Thud in rear diff

I noticed today that shifting into 2nd from 1st I hear a slight thud from the rear end, any thoughts?

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Old 02-25-2011, 08:36 PM   #2
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Re: Thud in rear diff

U Joint?
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Old 02-25-2011, 09:12 PM   #3
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U Joint?
Lolololol!!
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Old 02-26-2011, 07:54 AM   #4
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Re: Thud in rear diff

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Originally Posted by Project Pony View Post
I noticed today that shifting into 2nd from 1st I hear a slight thud from the rear end, any thoughts?

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Quote:
Originally Posted by 93CobraGuy View Post
U Joint?
Could be a u-joint, but I do notice this is common espescially on IRS equipped Mustangs. Tends to be a decent amount of slack b/w the driveshaft/rearend/transmission.
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Old 02-26-2011, 09:05 AM   #5
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I'll get under there and check things out.

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Old 02-26-2011, 12:39 PM   #6
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Re: Thud in rear diff

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I'll get under there and check things out.

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From your posts, it sounds like you are knowledgeable enough to know how to check U joints. Hope you find the culprit!
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Old 02-26-2011, 05:32 PM   #7
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I know my way around. I just rebuilt the rear end in my wife's explorer, and know that banging around back their is no good. Its coming from the diff. I had my son stick it in first while I was laying back there listening and it is something in their making a thud. I am tired of the smell of gear lube and don't want to tear it apart, but I may have to.....or stick an 8.8 in it.

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Old 02-26-2011, 05:39 PM   #8
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Re: Thud in rear diff

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I know my way around. I just rebuilt the rear end in my wife's explorer, and know that banging around back their is no good. Its coming from the diff. I had my son stick it in first while I was laying back there listening and it is something in their making a thud. I am tired of the smell of gear lube and don't want to tear it apart, but I may have to.....or stick an 8.8 in it.

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Thuds are no good for sure. Hell, if it were me, I'd just throw the 8.8 in and call it good.
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Old 02-26-2011, 06:19 PM   #9
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I'm going to keep my eyes out for an 8.8 with 3.73's and be done with it

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Old 02-26-2011, 06:31 PM   #10
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Re: Thud in rear diff

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I'm going to keep my eyes out for an 8.8 with 3.73's and be done with it

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Good call, you won't be disappointed.
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Old 02-28-2011, 10:10 AM   #11
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Re: Thud in rear diff

as all have said above also check the bushings on the lower control arms if the car is older~ I doubt thats it but if they are worn the rear can move front/back more and that could be it. Make sure the bolts are in all the way and not getting lose as well for upper and lower control arms.
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