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Old 08-23-2011, 10:52 PM   #1
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Rear end trouble

Hey guys I have a 2000 mustang v6 with 173000 on it. I bought the car for 400 and have been fixing it up since and needless to say it's one of the most reliable cars I've ever had. I've noticed that while driving I have a whine/ hum in the rear end. It doesn't start til about 20 mph and only happens while on the throttle. If I coast the noise goes away. Any ideas??
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Old 08-23-2011, 11:16 PM   #2
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Re: Rear end trouble

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Originally Posted by Dgerow12 View Post
Hey guys I have a 2000 mustang v6 with 173000 on it. I bought the car for 400 and have been fixing it up since and needless to say it's one of the most reliable cars I've ever had. I've noticed that while driving I have a whine/ hum in the rear end. It doesn't start til about 20 mph and only happens while on the throttle. If I coast the noise goes away. Any ideas??
Sounds like your rearend gears are getting worn.
And with that many miles it is likely they need to be replaced.

Have you noticed any slack in the driveline?
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Old 08-23-2011, 11:22 PM   #3
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Quote:
Originally Posted by Dgerow12
Hey guys I have a 2000 mustang v6 with 173000 on it. I bought the car for 400 and have been fixing it up since and needless to say it's one of the most reliable cars I've ever had. I've noticed that while driving I have a whine/ hum in the rear end. It doesn't start til about 20 mph and only happens while on the throttle. If I coast the noise goes away. Any ideas??
I got the same problem bro. Mine isthe same year and model
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Old 08-24-2011, 12:08 AM   #4
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Re: Rear end trouble

Drain the rearend oil, pull the cover and take a look at your ring and pinion gears. I bet you will find them to be considerably worn.
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Old 08-24-2011, 08:59 AM   #5
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I had the same problem with my Explorer. It's got louder as throttle increased and stop while coasting. Like everyone else has said, check the gears.
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Old 08-24-2011, 11:25 AM   #6
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That's what I figured but through alittle research I also found out that the rear end in my mustang is from a 94 mustang. I went to buy a diff cover seal and was gunna change the fluid but did not because the seal looked to big for the diff. Another thought to consider is when I got my car we had to replace the pinion seal. Could it be something to do with the pinion bearing?
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Old 08-24-2011, 02:06 PM   #7
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Re: Rear end trouble

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That's what I figured but through alittle research I also found out that the rear end in my mustang is from a 94 mustang. I went to buy a diff cover seal and was gunna change the fluid but did not because the seal looked to big for the diff. Another thought to consider is when I got my car we had to replace the pinion seal. Could it be something to do with the pinion bearing?
If someone has been into the rearend it is possible that the gears were not set up correctly to begin with and that is why they are making noise.
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Old 08-26-2011, 09:03 AM   #8
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Re: Rear end trouble

Correct. If someone was playing around in there and did not set the backlash correctly than you could get a whine. If that's not the case it sounds like worn gears which will also whine under load. I'd pull the cover and take a look.
When I did my 94 a while ago I had metal shavings all inside it, and the gears wear well worn.(220+k miles) I have seen complete rearends around me on craiglist for between 100-300 bucks for 8.8's. Could be cheaper than having the gears replaced and set. Take some pictures of it with the cover off and post them if you can.
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Old 08-30-2011, 09:04 PM   #9
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Time for an 8.8
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Old 09-05-2011, 06:09 PM   #10
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I would love an 8.8 only problem is no one around here has an 8.8 for a reasonable price
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Old 09-05-2011, 06:20 PM   #11
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I would love an 8.8 only problem is no one around here has an 8.8 for a reasonable price
Time to hit up the bone yard.
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Old 09-05-2011, 06:21 PM   #12
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Time to hit up the bone yard.
Tboneking might be there lol!
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Old 09-05-2011, 06:46 PM   #13
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Tboneking might be there lol!
Or here... Lol
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Old 09-07-2011, 09:58 AM   #14
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I have the same howl coming from the rear end. But it only does it when I'm giving it gas in high gears like 4th and 5th. Are those worn gears too?
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Old 09-07-2011, 10:00 AM   #15
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Re: Rear end trouble

a whine from the rear gears could be many things, mostly its not a huge issue~ but you never know.

If the bushings in your rear end are gone, worn out, etc it could be the extra transmission of noise from the rear end into the frame and thus you hear it~

Gears whine for MANY reasons, mostly its due to them not being installed correctly. If they have never been out then perhaps its low on fluid or has been low on fluid in the past and it caused damage.

check the fluid first.
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Old 09-08-2011, 04:59 AM   #16
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Re: Rear end trouble

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I would love an 8.8 only problem is no one around here has an 8.8 for a reasonable price
e-bay has two with 3.73 gears set up. I thought I remembered it being $800.00. Maybe i'm wrong about the price but there are a couple fully assembled on there. just a FYI for ya-
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