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Moser 9" questions?

This is a discussion on Moser 9" questions? within the Drivetrain forums, part of the LSx Technical Help Section category; I am looking at getting a Moser 9" from epp and was wondering what some of the terminology means? What ...

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    Member afattitude's Avatar
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    Moser 9" questions?

    I am looking at getting a Moser 9" from epp and was wondering what some of the terminology means?
    What does the spline refer to, and what is better or worse more or less?
    What is 3 channel, 4 channel and new reluctor rings? Can 3 channel not have abs or tcs?
    How long should my wheel stubs be? Is there anything wrong with stock?
    Gear ratio for me I think im going 3.89.
    Is the alum case just for weight. Is it weaker or anything?
    What is a backbrace?
    Anti roll bar brackets??
    True trac, Locker, Wavetrac?
    Why would I want the wheelbase narrower? Tires size maybe?

    Thanks in advance guys.

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    Senior Member Zboner's Avatar
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    i think your best bet is just to talk to Bob over there he should get you all figured out.

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    Quote Originally Posted by Zboner View Post
    i think your best bet is just to talk to Bob over there he should get you all figured out.
    Yep, It all depends on which way you want to go with the car.

    3 channel is ABS
    4 Channel is ABS/TCS BTW

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    Senior Member Zboner's Avatar
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    yup, i changed my mind and am now looking for a new center section.

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    Member afattitude's Avatar
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    I am looking to make a weekend driver and definetly will be making passes on the track every now and then.

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    Senior Member Zboner's Avatar
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    id go with the tru trac then 31 spline axels, and aluminum center section 1350 yoke.

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    Quote Originally Posted by afattitude View Post
    What does the spline refer to, and what is better or worse more or less?
    Spline is the numebr of "teeth" an axles has going around the part of the axles that goes into the differential. The higher the number the more teeth it has. Since there are more teeth there is more contact area betwwen the differential and the axles, so it is stronger.

    I have 35-spline axles/differential

    Quote Originally Posted by afattitude View Post
    What is 3 channel, 4 channel and new reluctor rings? Can 3 channel not have abs or tcs?
    3 Channel = ABS
    4 Channel = ABS and TCS

    I don't have either on mine.

    Quote Originally Posted by afattitude View Post
    How long should my wheel stubs be? Is there anything wrong with stock?
    Nothing wrong with stock if you have stock power. If you want more power it is a good idea to get stronger (ARP) studs.

    I have the long 1/2" ARP Studs.

    Quote Originally Posted by afattitude View Post
    Gear ratio for me I think im going 3.89.
    Are you A4 or M6? Since I have a M6, I have the 4.11s. It's your choice, but the car is rediculous in acceleration with those gears.

    Quote Originally Posted by afattitude View Post
    Is the alum case just for weight. Is it weaker or anything?
    Yeah, mostly for weight reduction, not sure about strength. I have the iron case, and believe me, it took two people to lift it. I think it is easily 300lbs heavier than a stock rear end.

    Quote Originally Posted by afattitude View Post
    What is a backbrace?
    It is a bar that is welded accross the back to make the rear more rigid. Probably not needed for street cars, but if you change your mind down the road, you can get it welded in later.



    Quote Originally Posted by afattitude View Post
    Anti roll bar brackets??
    The brackets the Sway Bar bolts to. You need them.

    Quote Originally Posted by afattitude View Post
    True trac, Locker, Wavetrac?
    True Trac = Limited Slip
    Locker (what I have) = Locker...has to disengage the locks when going around a corner...the "CLICK CLICK BANG BANG" becomes normal after awhile...pedestrians may look at you kinda funny...if only they knew
    WaveTrac = Never heard of it...Spool maybe?

    Quote Originally Posted by afattitude View Post
    Why would I want the wheelbase narrower? Tires size maybe?
    Narrowed wheelbase is for a tubbed rear running large tires..or if you want super dished rims.

    Hope this helped...if anything is wrong, please feel free to correct me

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    Quote Originally Posted by Zboner View Post
    id go with the tru trac then 31 spline axels, and aluminum center section 1350 yoke.


    I see you have decided to go away from the locker for the street?


    Just call Bob at EPP. Super nice guy, and he will give you all the answers to your questions. It is however, kinda hard to get ahold of him. Took me at least 2 days.
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    Senior Member Zboner's Avatar
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    im going to have to if i want to take the car on trips and what not, now i need to get a whole new center section, im pissed.

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    Quote Originally Posted by Zboner View Post
    im going to have to if i want to take the car on trips and what not, now i need to get a whole new center section, im pissed.
    This, is why I went tru trac. Thats a bummer dude

    But I think you will like the tru trac ALOT more for the street and some trips. Whats it gonna cost you?

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    Member afattitude's Avatar
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    I have an M6. What are the pros and cons of reving up faster with 4.11s or 3.89s?

    The Moser is about 300lbs heavier!? wow, I wonder why it is so much stronger.

    It getting the locker worths all the extra noise??

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    Senior Member Bottesini's Avatar
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    Quote Originally Posted by afattitude View Post
    I have an M6. What are the pros and cons of reving up faster with 4.11s or 3.89s?

    The Moser is about 300lbs heavier!? wow, I wonder why it is so much stronger.

    It getting the locker worths all the extra noise??
    Basically anytime you go with a higher numerical value gear ratio you gain acceleration, but lose top speed. I have 4.11s in mine and have had no problem with it. In fact it is the perfect gear ratio for my car in the 1/8 with stock height tires.

    There are some other advantages to having gear like 4.11s compared to 3.xx in that the rest of your drivetrain (clutch, tranny, driveshaft, etc) will not be working as hard, and will be able to handle the same amount of power better.

    I would not say it is 300 lbs heavier, but it is heavy assembled (the center chunk is 90-95 lbs in its shipping tub).

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    Member afattitude's Avatar
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    Will a UMI tunnel mounted torque arm work with a Moser 9"?? FMI

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    2 SS's are better than 1 Jays00ss's Avatar
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    I got 4.30 gears in My 9" and wouldn't have it any other way. Had 3.90's in my 10 bolt and was highly disappointed in them.

    For me, I went all out 1st time and got the 35 splined axles and Detroit locker (no clutches to burn up) Locker is truly awesome and after the initial break in of 50 miles, it quiets down and I don't even notice it at all anymore as a daily driver in the summer.

    Bad part about my set up is the parasitic loss through the drive train. You lose quite a bit of #'s at the dyno. I dynoed at about 408 RWHP through my 9" while others with the same set up as me with their stock 10 bolt are in the 440-445 hp range. BUT I don't have to worry when it comes to going to the track. Thats about right, They say you lose an extra 10% of your HP through a 9"
    Last edited by Jays00ss; 06-02-2009 at 09:05 AM.
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

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    Member afattitude's Avatar
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    Quote Originally Posted by Jays00ss View Post
    I got 4.30 gears in My 9" and wouldn't have it any other way. Had 3.90's in my 10 bolt and was highly disappointed in them.

    For me, I went all out 1st time and got the 35 splined axles and Detroit locker (no clutches to burn up) Locker is truly awesome and after the initial break in of 50 miles, it quiets down and I don't even notice it at all anymore as a daily driver in the summer.

    Bad part about my set up is the parasitic loss through the drive train. You lose quite a bit of #'s at the dyno. I dynoed at about 408 RWHP through my 9" while others with the same set up as me with their stock 10 bolt are in the 440-445 hp range. BUT I don't have to worry when it comes to going to the track.
    So you lost power by puting in a 9"?? wtf

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    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by afattitude View Post
    So you lost power by puting in a 9"?? wtf
    Yes and no. It eats about 10% of your horsepower (Its bigger, heavier, larger bearings, gears and axles) at the dyno, more with steeper gearing. Dynos like less gearing as well.

    Horse power is still there but the Dyno #'s are lower. The true #'s count out at the Drag Strip anyway.
    Last edited by Jays00ss; 06-02-2009 at 09:26 AM.

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    Quote Originally Posted by Bottesini View Post
    Basically anytime you go with a higher numerical value gear ratio you gain acceleration, but lose top speed. I have 4.11s in mine and have had no problem with it. In fact it is the perfect gear ratio for my car in the 1/8 with stock height tires.

    There are some other advantages to having gear like 4.11s compared to 3.xx in that the rest of your drivetrain (clutch, tranny, driveshaft, etc) will not be working as hard, and will be able to handle the same amount of power better.

    I would not say it is 300 lbs heavier, but it is heavy assembled (the center chunk is 90-95 lbs in its shipping tub).
    I can still hit 165 with my 4.10s...

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    Member afattitude's Avatar
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    Does anyone know about a UMI torque arm not working with a Moser 9"??

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    Quote Originally Posted by afattitude View Post
    Does anyone know about a UMI torque arm not working with a Moser 9"??
    I don't see why not. You might want to make sure that it comes with two sets of holes for the rear to bolt to. This is because the 9" bracket is about half an inch farther to the driver's side than the stockers and 12-bolts. My Spohn Torque Arm had two bolts and I bolted it to the wrong set of holes and the angle was visibly off, so I had to unbolt everything and do it again.

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    Quote Originally Posted by afattitude View Post
    Does anyone know about a UMI torque arm not working with a Moser 9"??
    See no reason why it wouldnt.

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