Gears & Axles Driveshafts | Rearends | Differentials | Gears | 12 Bolt | 9 Inch | Dana

Think it's time for a 12 bolt (see inside)

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Old 03-12-2008, 07:44 PM
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Default Think it's time for a 12 bolt (see inside)

Ok so the car I bought came with a upgraded Torsen unit that had 4.10's in it. Well that rear end went bye bye about a month or so ago. A friend of mine gave me a stock 10 bolt that had after market 3.42's in it. Here's my problem.

The rear end whined from the very beginning. Now, sometimes when I give it gas hard there is a LOUD popping noise coming from the rear end. I mean it is LOUD. At first it was only when I gave it gas hard. Now, when I go around corners it is making the noise also. Last night I got under the car and adjusted my suspension and installed my LCA relocation brackets. I did notice that the torque arm was hitting in a small place on the tunnel but other than that there wasn't anything noticeable that would make it bind and pop REALLY loud like it is doing.

Not only does the rear pop but it feels like something is binding up and the car won't turn easy and jerks really bad.

Is it more than likely the rear end?? If that is the case then I am going to say F it and just order a 12 bolt tomorrow.

Any input would be appreciated.
Old 03-12-2008, 08:47 PM
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The axle can turn/pivot enough to cause that torque arm to hit hard. Get that fixed first before making a rash decision; the new rearend could have the same problem ya know?
Old 03-12-2008, 10:35 PM
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I already checked the torque arm and like I said it just seems to rub in one place. i just put the car in the garage and it feels like something is binding and popping really bad. it does it really bad when i am turning but also does it when accelerating. i know what a hitting torque arm feels like but this is definetly not that.

It almost feels like it is coming from right under my arm in the tunnel but i guess if it was in the rear end it would magnify it too. also today when i had it out it popped really bad and jerked the whole car and my abs inop light came on.
Old 03-13-2008, 04:23 AM
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Exotic Performance Plus strongly recommends the Moser nine inch. This rear is even tougher than the Moser 12 bolt, and the horsepower of the late model F Body cars keeps escalating every year, which requires a very strong rear. With the recent introduction of the 6.2L GM aluminum block and the excellent flowing 6.2 litre heads, the horsepower of these cars is going to just keep climbing at a very fast pace.The nine inch will handle the power, plus we prefer the way the torque arm is bolted to the nine inch in the same way the oem rear-end is attached. (This is the only good thing about the stock 10 bolt...) The Moser 12 bolt uses four short bolts to attach the torque arm, and they have a habit of loosening up, even when loc-tite is used. Why the nine inch is stronger than the 12 bolt. The 9-inch has an internal rear-pinion support that also supports the gear end of the pinion to limit gear deflection under high torque loads. This seems to be the major reason why the 9 inch doesn't start whining after high rpm clutch dumps, when the 12 bolt will pick up noise.The 9-inch locates its pinion gear lower on the ring gear to improve tooth contact, than the 12 bolt does.The 9-inch has a 0.125-inch larger ring-gear diameter and internal pinion support than the 12 bolt does. This is not much of a difference, but it is worth noting.
Put a 12 bolt into a early Chevelle, Nova, Camaro, etc and you can beat the crap out of it, and not hurt anything. Put one into one of our cars with a torque arm, make a couple 4000 to 5000 dragstrip launches, and I can just about guarantee you'll pick up gear noise. If it is a drag only car, you'll never know or care about the gear noise. Drive your car home from the track, and the noise will drive you nuts. I feel the torque arm stresses the 12 bolt housing, causing distortion. We have never seen this happen with the 9 inch housing.
http://www.exoticperformanceplus.com....html?item=145 Bob
Old 03-13-2008, 08:33 AM
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Thanks, but right now I'm really looking at troubleshooting this rear end. I don't want to buy a 2600 dollar rear if that isn't going to fix my problem.
Old 03-13-2008, 10:21 AM
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that same exact problem happened to me, it binds when you turn and when you back up and turn, also my abs inop light came on. If it does mine was doing the same, after about 1 week of doing it the spiders gears blew. When it got tore down i discovered a c-clip had worked its way off of the axle and into the spiders and blew them up somehow

Last edited by outlawtorn; 03-13-2008 at 10:24 AM. Reason: left out info
Old 03-13-2008, 10:31 AM
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Originally Posted by outlawtorn
that same exact problem happened to me, it binds when you turn and when you back up and turn, also my abs inop light came on. If it does mine was doing the same, after about 1 week of doing it the spiders gears blew. When it got tore down i discovered a c-clip had worked its way off of the axle and into the spiders and blew them up somehow
Yep, it pretty much does EXACTLY that. When I back out of a parking spot or just turn a corner it does it. It is getting more frequent now so I have a feeling the rear is going to be going bye bye VERY soon.
Old 03-13-2008, 01:28 PM
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pop the cover and start inspecting, if its toast and your going to go aftermarket look into strange...I've had 2 moser 12 bolts, on the first one the weld where the axle tube meets the center section broke and the tube pulled out and bent the axle, the 2nd rear leaks worse then the titanic and is pretty damn noisy...just my thoughts
Old 03-13-2008, 01:45 PM
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Mine was doin that & it ended up being the case to the posi busted open. It was wiggling just enough to let the pinion gear pop off & rub the posi housing. Thats what I think the popping noise & feel was too(gears jumpin on & off). Here is a pic....



Old 03-13-2008, 02:03 PM
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Thanks guys, I may have to pop the cover off and see what it is.
Old 03-13-2008, 02:33 PM
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Definately sounds like the differential carrier is the problem. I would also check for any fractured teeth on the ring gear and pinion as shock load can cause a problem with the gear too.

Jeff




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