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Moser 9" is screaming at me

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Old Jan 30, 2011 | 09:22 PM
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Default Moser 9" is screaming at me

Alright so I bought a used Moser 9" off a member here about 2 months ago. He assured me it was good to go and only had 6k miles on it. He said that he had a "certified" Mechanic who specializes in gears and axles inspect it, and check the pattern and he said it was in great shape.. I took his word for it because we spoke on the phone and he has over 200 positive itrader ratings. Anyways I finally got my car going and right away, first drive, this thing is so freaking loud! It's an ear piercing whine. Top of third and up sounds like a freight train is barreling down on me! It gets louder the faster you go and as soon as you let off the gas it goes away. I was told it has 31 spline axles, 3.50 gear, and an auburn limited slip. So I guess my question is, Is this normal? I know some gear sets are louder than others but idk what this has in it. Some insight would be appreciated. Thanks,

-Sean
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Old Jan 30, 2011 | 10:34 PM
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What brand and weight rear end lube did You use?
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Old Jan 30, 2011 | 10:51 PM
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Lucas 85 140. Would that affect the noise?
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Old Jan 30, 2011 | 11:05 PM
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Do you have aftermarket suspension parts with rod ends?
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Old Jan 30, 2011 | 11:05 PM
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Originally Posted by 89L98T56
Lucas 85 140. Would that affect the noise?
You used a good brand! The question was more of a way to determine You indeed put in the necessary oil without sounding like an accusation.

You might pull the drain plug and get a sample of the oil from the face of the plug to see if there are metal grindings on it.

How much backlash is there at the pinion?

Carl
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Old Jan 30, 2011 | 11:17 PM
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Originally Posted by Zmg00camaross
Do you have aftermarket suspension parts with rod ends?
No they are all Poly bushed.

Originally Posted by Carl at CRP
You used a good brand! The question was more of a way to determine You indeed put in the necessary oil without sounding like an accusation.

You might pull the drain plug and get a sample of the oil from the face of the plug to see if there are metal grindings on it.

How much backlash is there at the pinion?

Carl
Ah I see. That is a good idea. So are there any set-ups that are normally noisy? Or is noise a sign of premature wear?
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Old Jan 30, 2011 | 11:25 PM
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Originally Posted by Carl at CRP
You used a good brand! The question was more of a way to determine You indeed put in the necessary oil without sounding like an accusation.

You might pull the drain plug and get a sample of the oil from the face of the plug to see if there are metal grindings on it.

How much backlash is there at the pinion?

Carl
U say Lucas gear oil is good oil ? im asking cause i am using it now, and im thinking switch to different brand.
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Old Jan 30, 2011 | 11:28 PM
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Noise can be caused by so many different things, poor set-up, poor quality ring and pinion, bearings and the number one killer in this industry...abuse. But that is why we buy these parts so we can abuse them!

Take Your time, do some trouble shooting trying to pin the noise down and hopefully it will be something simple.

Carl
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Old Jan 30, 2011 | 11:51 PM
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This is a serious noise. Almost un-bearable to drive. I can't hear my radio or exhaust over it.
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Old Jan 31, 2011 | 01:29 AM
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It is not normal and you need to inspect it, or have someone do it.
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Old Jan 31, 2011 | 05:49 AM
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Originally Posted by Carter Hays
It is not normal and you need to inspect it, or have someone do it.
I agree, and in the end it may take a new set of gears. You can have two identical appearing set of gears and one can be loud and the other one quiet. Bob
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Old Jan 31, 2011 | 06:41 AM
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what kind of trq arm ya runnin ? i know chassis mnts will channel a lot of noise thru . butttt if ya say ya cant hear your sterio over it ya deff have a problem beyond that . if its on accel id be lookin at ring and pinion make sure the yoke for the rear is tight and has no play . or drop the oil and see what it looks like . if ya dont know how to do rears id take it to someone who does , seein its its very easy to do but even easier to screw up in there
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Old Jan 31, 2011 | 09:17 AM
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Originally Posted by 89L98T56
This is a serious noise. Almost un-bearable to drive. I can't hear my radio or exhaust over it.
You need to stop driving it and pull the center section out and inspect it.
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Old Jan 31, 2011 | 09:19 AM
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I would not drive with that much noise, I do not think pinion angle would cause that problem, but with a new install I would sure recheck it, if I were install new gears I would use a solid crush sleeve then when you get a good pattern it an't going to change
Johnny
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Old Feb 1, 2011 | 10:16 PM
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im running a stock torque arm and driveshaft and the car is lowered a lot. I have built multiple 10 bolts but never even seen inside a 9" thats why I am hesitant to tear into it.
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Old Feb 1, 2011 | 10:40 PM
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are any rear gears made in china?
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Old Feb 1, 2011 | 10:44 PM
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Originally Posted by 89L98T56
im running a stock torque arm and driveshaft and the car is lowered a lot. I have built multiple 10 bolts but never even seen inside a 9" thats why I am hesitant to tear into it.
if you are "lowered a lot" and running a stock TA I think your angle is going to be off quite a bit, now that may not be your noise problem but I think you need am adjustable TA.
as to the rebuild the 9" is a peace of cake compared to the 10 bolt

http://www.ford-trucks.com/article/i...ear_Setup.html
good luck , Johnny
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Old Feb 2, 2011 | 04:11 PM
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Originally Posted by garygnu
are any rear gears made in china?
Yeah lots of them.
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Old Feb 2, 2011 | 09:04 PM
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I was just thinking, I have the stock torque arm, and no LCA relocation brackets..... would severe pinion angle possibly be the culprit?
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Old Feb 2, 2011 | 09:34 PM
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Originally Posted by 89L98T56
I was just thinking, I have the stock torque arm, and no LCA relocation brackets..... would severe pinion angle possibly be the culprit?
If it is which I doubt you still need to tear that baby down. You got it used it needs a good look see. As mentioned the 9" is cake compared to 10, 12 bolts etc...
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