411 gearing in a 9inch

**Rk ws6** · 08-16-2009, 04:58 PM

I blew out my 7.5 10 bolt which is no big suprise and within the next week or so i will be ordering my moser 9inch. I am debating on going with either a 3.89 gear or a 4.11 gear now keep in mind i am a m6 car with a built trans and was wondering if anything else would be needed motor wise ect.... to run 411s any issues? also i have a tunnel mount torque arm... opinions much appreicated

p.s. i will be getting the detriot locker

**35th-ANV-SS** · 08-16-2009, 05:08 PM

I just purchased the Moser 9" with Trutrac and got the 4.11 gear. I love it. I also got the BMR Trak Pac to replace the stock torque arm.

No issues here.

I was told that the 3.89 is a special cut gear and that typically it is noisier. This may be something you want to consider.

**Rk ws6** · 08-16-2009, 06:11 PM

Originally Posted by 35th-ANV-SS

I just purchased the Moser 9" with Trutrac and got the 4.11 gear. I love it. I also got the BMR Trak Pac to replace the stock torque arm.

No issues here.

I was told that the 3.89 is a special cut gear and that typically it is noisier. This may be something you want to consider.

yea im definently going to consider that i think im almost dead set on 4.11s

**Hi-Po** · 08-17-2009, 05:52 PM

No reason to ever go anything less in a 9" with a 6 speed.

**Rk ws6** · 08-18-2009, 04:49 PM

thanks hi po thats what i was figuring .... plus im told to stay away from aluminum center section due to it wont hold up in the long run like the iron nodular center section will plus i believe when the aluminum center section gets hot it warps the case and makes the gears whine... but i dunno

**Hi-Po** · 08-19-2009, 09:01 AM

Ive never heard that before. I doubt it gets hot enough to do any of the above. If you have the cash, opt for the aluminum center. Its shaves some 30 pounds off.

**Spaz** · 08-19-2009, 09:10 AM

Originally Posted by Hi-Po

No reason to ever go anything less in a 9" with a 6 speed.

there sure is... if he plans on forced induction he will more than likely want 3.42 - 3.73... if he is going to put in a big cam later on the 4.11's are a must...

**Rk ws6** · 08-19-2009, 02:33 PM

Originally Posted by Hi-Po

Ive never heard that before. I doubt it gets hot enough to do any of the above. If you have the cash, opt for the aluminum center. Its shaves some 30 pounds off.

word is its weaker

**Rk ws6** · 08-19-2009, 02:35 PM

Originally Posted by Spaz

there sure is... if he plans on forced induction he will more than likely want 3.42 - 3.73... if he is going to put in a big cam later on the 4.11's are a must...

my future plans motor wise are up in limbo id love boost but my boss is pushing me towards n/a

**35th-ANV-SS** · 08-19-2009, 02:50 PM

Originally Posted by Rk ws6

my future plans motor wise are up in limbo id love boost but my boss is pushing me towards n/a

I would not worry about what "other" people are pushing you to do, I'd do what YOU want to do IMO.

I have heard the same thing about the AL center section....not sure if there is any evidence out there to back it up though. Haven't had the need to research it.

**Hi-Po** · 08-19-2009, 05:06 PM

Originally Posted by Spaz

there sure is... if he plans on forced induction he will more than likely want 3.42 - 3.73... if he is going to put in a big cam later on the 4.11's are a must...

Sure.