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Old 05-23-2019, 07:28 PM   #71
Joe M 2012 2SS


 
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I'm shocked you guys have quiet 3.91 gears. My first set, Motive, installed by someone with 40 yrs automotive experience howled like a wolf.

My second set was fairly quiet after installation, done by a mechanic who was a head mechanic at a GM dealership for many years, and had done hundreds of GM rear ends, but the gears now howl between 35-45 mph, GM 3.91.

I guess you just have to get lucky and get a set that is machined right. The backlash was set perfectly at .007 on my GM set, but it still has gear whine.
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Old 05-23-2019, 07:28 PM   #72
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Quote:
Originally Posted by Joe M 2012 2SS View Post
I'm shocked you guys have quiet 3.91 gears. My first set, Motive, installed by someone with 40 yrs automotive experience howled like a wolf.

My second set was fairly quiet after installation, but now howls between 35-45 mph, GM 3.91.

I guess you just have to get lucky and get a set that is machined right. The backlash was set perfectly at .007 on my GM set, but it still has gear whine.
From what I understand, the AAM gears (OEM GM 3.91) should fit like a glove and in most cases, be nearly noise free. This is of course assuming all other parts of the diff are within normal wear.

To those not aware, AAM (American Axle & Manufacturing) are the gears you should be looking to find for best fitment. They are the OEM gear manufacturers for the american big 3, and manufacture the OEM 1LE gears. So if you are questioning if your Genuine GM 3.91s are legit OEM, they will have been manufactured by AAM.

Bottom line, they are not genuine 3.91 1LE gears if they are not AAM gears. EDIT: That doesn't mean they are crap gears though, just not genuine GM OEM '1LE 3.91' gears.
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Old 05-23-2019, 07:34 PM   #73
Joe M 2012 2SS


 
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Originally Posted by InFiD3ViL View Post
From what I understand, the AAM gears (OEM GM 3.91) should fit like a glove and in most cases, be nearly noise free. This is of course assuming all other parts of the diff are within normal wear.

To those not aware, AAM (American Axle & Manufacturing) are the gears you should be looking to find for best fitment. They are the OEM gear manufacturers for the american big 3, and manufacture the OEM 1LE gears. So if you are questioning if your Genuine GM 3.91s are legit OEM, they will have been manufactured by AAM.

Bottom line, they are not genuine 3.91 1LE gears if they are not AAM gears.
I have AAM in now, they still are noisy. If they aren't machined properly, it doesn't matter how well they are installed/broken in...they will make noise eventually.
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Old 05-23-2019, 07:56 PM   #74
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I have AAM in now, they still are noisy. If they aren't machined properly, it doesn't matter how well they are installed/broken in...they will make noise eventually.
Damn, that sucks.
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Old 05-23-2019, 09:45 PM   #75
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Well a temporary howl at 35-45 mph isn’t so bad. I thought it’s something you would hear all the time
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Old 05-24-2019, 09:40 AM   #76
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3 years now....had them installed at 11 am on a fri. Drove 2 hours to the drag strip for Fri night street car battles....ran all night. Drove 3 hours home......done.
Yes! This is how it's done. It's not an engine, break it in how yer gonna drive it. They should probably be broken in the same way.
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Old 05-24-2019, 05:08 PM   #77
Joe M 2012 2SS


 
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Well a temporary howl at 35-45 mph isn’t so bad. I thought it’s something you would hear all the time
No it's not as bad as the Motive was, but being I do 90% of my driving in the city....speed limit 35 mph....I do hear it a lot.
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Old 05-24-2019, 08:09 PM   #78
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Originally Posted by Moto-Mojo View Post
Yes! This is how it's done. It's not an engine, break it in how yer gonna drive it. They should probably be broken in the same way.
Yep.....way to much sand bagging when i comes to gears. Hit the highway at different speeds. .let them warm up and have a good cool down hit the strip..that's it.
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