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Whats required to swap in a 9"

This is a discussion on Whats required to swap in a 9" within the Drivetrain forums, part of the LSx Technical Help Section category; So my rearend is going to hell and I've decided to put in a 9" rearend. However I cant find ...

  1. #1
    Big Gulps, huh? HOBS's Avatar
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    Whats required to swap in a 9"

    So my rearend is going to hell and I've decided to put in a 9" rearend. However I cant find any threads that actually deal with what if any other parts are required to swap one in. So basically I'm looking for a parts list of stuff that I'll need to swap a 9" into my T/A (besides the actual diff) and what if any parts I'll need to modify. Also how well does a spool hold up to DD? Any help would be greatly appreciated.
    -Hobs

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    Veteran Hi-Po's Avatar
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    Really isnt alot of extra parts needed. A few bolts maybe for the TQ arm. Some Loctite, Oil, Tq wrench, and some basic tools. Thats it man. And I would look into a Tru Trac for a DD.

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    🤔 11s. blackbirdbrain89's Avatar
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    i dont mind my locker for a dd no real issues.... ull have to pull ur old diff apart and get the end plats and ull need a press to but the new berings on the axles... do not get 35 spline axles for dd... mine has to much play in them for my likeing

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    Senior Member Bottesini's Avatar
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    Most of it is fairly easy to install. What I needed that did not come with the rear end from Moser was a U-joint (you can get from Napa), and 2 3" universal exhaust clamps. Other than that most of is just putting back what you took off. There are a few things I had to make work like the brakes brackets (the ones at the lower LCAs) and the sway bar.

    You will also need a few random things to assemble the rear end (oil, silicon). Exotic Performance Parts has a fair write up of all that you will need and how to go about it.

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    Veteran Hi-Po's Avatar
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    I also had to do alittle modifing to the brake brackets. That was the only part that didnt bolt right in easily.

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    Big Gulps, huh? HOBS's Avatar
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    Thanks for the help guys. I got a few more questions for ya if you dont mind. I've been pokin around a lil more and I keep hearing that I need an adjustable torque arm and a different sway bar is that correct? As far as the 3-channel and 4-channel thing is concered if I want to keep my ABS and TCS then I need(have) the 4-channel right? Also I'm eventually gonna put a power-adder on it at some point so would the 31 spline handle it or am I gonna blow it up in a month. My car's an A4 for so it wouldnt need to handle dropping the clutch at 5000 rpms and I have no interest in a trans brake but it will have a line-lock. Thanks again

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    Senior Member Bottesini's Avatar
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    Quote Originally Posted by HOBS View Post
    Thanks for the help guys. I got a few more questions for ya if you dont mind. I've been pokin around a lil more and I keep hearing that I need an adjustable torque arm and a different sway bar is that correct? As far as the 3-channel and 4-channel thing is concered if I want to keep my ABS and TCS then I need(have) the 4-channel right? Also I'm eventually gonna put a power-adder on it at some point so would the 31 spline handle it or am I gonna blow it up in a month. My car's an A4 for so it wouldnt need to handle dropping the clutch at 5000 rpms and I have no interest in a trans brake but it will have a line-lock. Thanks again
    I think you will be fine at 31 spline. Of course it still depends on how much power you will make in the end (mine is planned to work with a 402 and nitrous). I would make sure thought with the manufacture. For anything bigger you will have to at least go with a Detroit Locker instead of a the true track.

    As for the 4/3 channel issue, check to see what you have. If you have an set of electric wires running directly to the top of your pumpkin you have a 3 channel setup. Most likely you have a 4 channel setup and that runs to each of the axles instead.

    I am still running the stock sway and torque arm on mine. It is a good idea to get some adjustable suspension stuff, like a panhard and LCAs to help things get lined up.

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