Moser 12 bolt noise
Moser 12 bolt noise I've got a '99 SS I just bought with a recently put in Moser 12 bolt. I've got a pretty good howl coming from it. My question is that I've heard that this normal with these rear ends, but I really have a hard time believing that. Can anyone give me a good knowledgible answer? Be much appreciated. Thanks.
Staging Lane
Joined: Nov 2007
Posts: 66
Likes: 0
From: South Jersey
I have had a similar experience with my Moser 12-bolt with 3:73 gears, 33 spline axles, True Track differential..
The noise mine made was totally unacceptable.
So I spoke with Moser tech requested the name of the tech and email contact info and then sent them a Video so that they could hear what I was experiencing.
I also contacted the vendor I purchased the rear end through to put additional pressure on them..
The tech later admitted their batch of 3:73 gears Made by U.S. Gear were showing signs of being excessively noisey..
The story I got from them was that they used to use Motive Performance gears in their 12-bolts but in order to save $ they went with a cheaper priced gear vendor U.S. Gear..
So we reached an agreement of them sending me Motive Performance Gears and everything required to do a gear change..
Along with them refunding me the cost for the gear install that is included in the price of the 12-bolt..
The noise mine made was totally unacceptable.
So I spoke with Moser tech requested the name of the tech and email contact info and then sent them a Video so that they could hear what I was experiencing.
I also contacted the vendor I purchased the rear end through to put additional pressure on them..
The tech later admitted their batch of 3:73 gears Made by U.S. Gear were showing signs of being excessively noisey..
The story I got from them was that they used to use Motive Performance gears in their 12-bolts but in order to save $ they went with a cheaper priced gear vendor U.S. Gear..
So we reached an agreement of them sending me Motive Performance Gears and everything required to do a gear change..
Along with them refunding me the cost for the gear install that is included in the price of the 12-bolt..
Last edited by NJ 2002 Z28; Aug 15, 2009 at 04:41 PM.
I bought a Moser 12 bolt with 4.11 gears in it, and it had howl coming from it. So i took it to my work and we took it all apart and everythang looked good put it back together and it still howl's.
Teching In
Joined: Jul 2009
Posts: 14
Likes: 0
From: Jersey
When mine was fresh out of the box, it was dead quiet, but after a few runs it developed a slight howl on decel. I haven't pulled any impressive 60' yet either.
Is yours audible on accel over the exhaust noise?
Is yours audible on accel over the exhaust noise?
Mine is noisy under load, off gas - nothing. It's loud, and I've got some loud 3 inch exhaust with a flowmaster and you can hear it over that. But you can really only hear about 45mph or more. I'm probably going to go out and put a new gear set in and put richmonds in it and just be done. It's driving me nuts!
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Teching In
Joined: Nov 2008
Posts: 30
Likes: 0
From: Norcal-Cencal
i had a new moser 12 bolt put in not long ago and mine howls and makes noises when cruising on the highway or letting off on the gas but when i get on it it goes away. i have stock exhaust and before i bought it they said the 12 bolt do make noise
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I bought my 12 bolt direct from Moser and I noticed 2 things with 2 different gear sets.
3.42's from Moser- After racing it a few times there was some gear noise on the decel, not accel. Kinda annoying but oh well.
I swapped out for a set of 4.10's set up by a local shop and I hear a little bit of noise on the accel, nothing on decel. The gears are quieter then what Moser did.
Noise will be standard, It maybe on part with the sound of a blown 10 bolt.
3.42's from Moser- After racing it a few times there was some gear noise on the decel, not accel. Kinda annoying but oh well.
I swapped out for a set of 4.10's set up by a local shop and I hear a little bit of noise on the accel, nothing on decel. The gears are quieter then what Moser did.
Noise will be standard, It maybe on part with the sound of a blown 10 bolt.
The more I hear and research these moser 12 bolts, the more i hear that they are using cheaper gears in the newer one versus other previous years. Whether there is truth to that or not, is yet to be found out. Thanks for everyone's input so far.
Mine absolutely SCREAMS when cruising from 45-65 MPH. Quiet under acceleration and deceleration all the time though. Unfortunately I do most of my driving in the noisy 45-65 zone 
. Mine has 4 series 3.73 Yukon gears and 30 spline axles. The pattern on the gears is beautiful too. Just gotta live with it and turn up the stereo.
. Mine has 4 series 3.73 Yukon gears and 30 spline axles. The pattern on the gears is beautiful too. Just gotta live with it and turn up the stereo. Teching In
Joined: Jul 2009
Posts: 14
Likes: 0
From: Jersey
I bought my 12 bolt direct from Moser and I noticed 2 things with 2 different gear sets.
3.42's from Moser- After racing it a few times there was some gear noise on the decel, not accel. Kinda annoying but oh well.
I swapped out for a set of 4.10's set up by a local shop and I hear a little bit of noise on the accel, nothing on decel. The gears are quieter then what Moser did.
Noise will be standard, It maybe on part with the sound of a blown 10 bolt.
3.42's from Moser- After racing it a few times there was some gear noise on the decel, not accel. Kinda annoying but oh well.
I swapped out for a set of 4.10's set up by a local shop and I hear a little bit of noise on the accel, nothing on decel. The gears are quieter then what Moser did.
Noise will be standard, It maybe on part with the sound of a blown 10 bolt.
I am using the 4.10 from Moser. It was loud from the minute it left my driveway including mile number 1. It aint breaking thats for sure but the level of noise is beyond my limit even for a racecar.
mine was dead quiet... until i started going to the track with it. then it got a little bit louder every trip. i recently broke my gears (due to my torque arm coming loose) and had them replaced with motives.
dead quiet again... so far... but i havent been to the track with them yet.
dead quiet again... so far... but i havent been to the track with them yet.