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10 bolt, 12 bolt, 9 inch

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Old 05-16-2008, 03:01 AM   #1
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Default 10 bolt, 12 bolt, 9 inch

What exactly is the difference between the 10 bolt, 12 bolt and 9 inch rear ends?? Are there any exterior differences so that you can tell which is which w/o opening them up?
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Old 05-16-2008, 08:45 AM   #2
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TONS of differences! The 10 bolt and 12 bolt rears can be identified by the respective number of bolts on the differential cover. The 9" notable feature is it's removable 3rd member (or "center section"). Here's some pictures:

My old stock 10 bolt (w/TA aluminum cover)
Click the image to open in full size.

My Moser 9"
Click the image to open in full size.

and a Moser 12 bolt
Click the image to open in full size.
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Old 05-16-2008, 11:26 AM   #3
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Quote:
Originally Posted by jmm98LS1 View Post
TONS of differences! The 10 bolt and 12 bolt rears can be identified by the respective number of bolts on the differential cover. The 9" notable feature is it's removable 3rd member (or "center section"). Here's some pictures:

My old stock 10 bolt (w/TA aluminum cover)
Click the image to open in full size.

My Moser 9"
Click the image to open in full size.

and a Moser 12 bolt
Click the image to open in full size.
How bad is the install for the Moser 9in? Does it just bolt in?
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Old 05-16-2008, 11:49 AM   #4
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well.. simply put, the difference of greatest significance is the actual size of the ring and pinion gears... in a 12 bolt, a 9", or a dana, the gears are much larger, (and therefore can withstand greater stresses) than the stock 10 bolt
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Old 05-16-2008, 12:14 PM   #5
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Yes, it will bolt right in. Go to the gears and axels section for more info. Dozens of topics there. And im sure Bob at EPP will be all over you and help you any way needed.
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Old 05-16-2008, 02:02 PM   #6
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Are there any aftermarket diffs that are considered better than others or is it all personal preference?
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Old 05-16-2008, 02:13 PM   #7
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The 9in rear is all in all the strogest of the 3. Being that you have a M6 if you plan on putting some sticky tires on it and going to the track a 9inch is in your best interest.
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Old 05-16-2008, 02:37 PM   #8
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Differance internaly is ring gear size

F-body 10 bolt- 7.5"
12 bolt - 8.875"
9" - 9"
Dana 60 - 9.75"

but yeah from the outside just count the bolts on the cover or on the nine inch the front of the center section comes off
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Old 05-16-2008, 02:44 PM   #9
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Just don't confuse the 9" with a 8". They also have a removeable third member, but are smaller in size. Just wanted to clarify that for the untrained eye looking for a third member only.
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Old 05-16-2008, 02:49 PM   #10
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9" > 12 bolt > 10bolt

I got the 9", but gear noise sucks. Probably just the install though.
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Old 05-16-2008, 04:17 PM   #11
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the 12 bolt is very strong though and will waste less HP than a 9in, so it really depends how hard you want to be on it, I believe it also weighs less
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Old 05-16-2008, 04:45 PM   #12
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Dana 60 is bigger than the 9 inch and is cheaper. plus you can keep your ABS and ASR/TCS. its also cheaper. little stronger than the 12 bolt, but not as strong as the 9inch.
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Old 05-16-2008, 04:52 PM   #13
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How much does a new 9" or 12 bolt cost?
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Old 05-16-2008, 05:20 PM   #14
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Quote:
Originally Posted by bww3588 View Post
Dana 60 is bigger than the 9 inch and is cheaper. plus you can keep your ABS and ASR/TCS. its also cheaper. little stronger than the 12 bolt, but not as strong as the 9inch.
Are you sure? I was under the impression that an S60 is as strong, or stronger than a 9".
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Old 05-16-2008, 05:44 PM   #15
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Quote:
Originally Posted by melchoir View Post
Are you sure? I was under the impression that an S60 is as strong, or stronger than a 9".
positive, the 9 inch having the 3rd member and not a traditional carrier like the D60 has, makes it a little stonger.
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Old 05-16-2008, 06:22 PM   #16
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Quote:
Originally Posted by melchoir View Post
Are you sure? I was under the impression that an S60 is as strong, or stronger than a 9".
i was under the same impression...
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Old 05-16-2008, 06:59 PM   #17
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Quote:
Originally Posted by skeels View Post
Yes, it will bolt right in. Go to the gears and axels section for more info. Dozens of topics there. And im sure Bob at EPP will be all over you and help you any way needed.
There are rumors that you may have to cut up the body in order to make the Moser 9" fit, and that the torque arm has tunnel clearance issues.

so I gotta ask...how much truth is there to that?
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Old 05-16-2008, 07:46 PM   #18
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Quote:
Originally Posted by demonpixel View Post
There are rumors that you may have to cut up the body in order to make the Moser 9" fit, and that the torque arm has tunnel clearance issues.

so I gotta ask...how much truth is there to that?
simply not true. my bolted right in.
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Old 05-16-2008, 08:16 PM   #19
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yah my 9" from moser bolted up just fine, and yes because the ring gear is not secured by main caps in the 12 bolt and dana 60 setup it can take a sudden impact better, if it is for daily driving get a 12 bolt, if you want to make power with a m6 and launch the hell out of it you need a 9".

on a 9" if you will drive on the street people like the truetrak, where if it is a strip car the spool is way stronger, i drive my spool 9" with 27" tall et streets on the street once a week and have no problems.

on a 12 bolt just get the posi for street and a locker for the strip.

weight between the two is stupid sense the weight you add is over the wheels where you want the weight anyways.
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Old 05-16-2008, 09:15 PM   #20
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Quote:
Originally Posted by 71-Camaro-98 View Post
How much does a new 9" or 12 bolt cost?
about 2500 all said and done, but while you're dropping the rear you mine as well change the fuel pump if you plan on doing some big mods later on.
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