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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > LSD Expectations



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      09-16-2018, 01:51 PM   #1
Ozzie335i
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LSD Expectations

Looking for information on swapping out the open differential for an LSD. What I am not asking for is whether or not anybody really needs it.

When buying an LSD there seems to be two options: buying just the assembly and having a highly competent mechanic install it, or get a pumpkin and swap that. I believe the going rate for the assembly is about 900 or 1000, and a complete pumpkin is around 2000 +.

What are the expectations when buying a complete pumpkin? Basically what I am asking is what is reasonably expected for what internally should be rebuilt / refurbished / replaced other than just the LSD assembly? What are we really getting for the extra thousand dollars?
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      09-16-2018, 02:43 PM   #2
335e92tx
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Just a unit that has been set up by a knowledgeable individual and will likely have a full warranty,

Look for used on https://www.e90post.com/forums/forumdisplay.php?f=177

I had a wavetrac put in my first e92 and a pumpkin done for the is

Having one setup involves making sure the right shims are avail.
.took a week longer for the checking of clearance and then order/arrival
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Last edited by 335e92tx; 09-16-2018 at 03:13 PM.
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      09-16-2018, 03:07 PM   #3
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Buying a built diff from a reputable seller assumes a few things:
-new seals/bearings/proper fluid
-proper gear backlash set up
-aforementioned warranty on build

Going out and locally getting a guy to set up your diff might save you a few bucks, but how many diffs does your local guy do? If you have a guy that you know has the knowledge, time and capability to set it up correctly, then by all means go for it!

Getting a diff setup from an established seller/builder gives the confidence it is done right to begin with.

Me personally? There are not a lot of guys around my neighborhood(as in none) that I would trust to build me a diff. Having said that, I do my own.
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      12-05-2018, 05:34 PM   #4
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Selling an e92 m3 rear end swap, everything you need including differential oil. PM if you’re interested!
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      12-05-2018, 08:58 PM   #5
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Quote:
Originally Posted by Ozzie335i View Post
Looking for information on swapping out the open differential for an LSD. What I am not asking for is whether or not anybody really needs it.

When buying an LSD there seems to be two options: buying just the assembly and having a highly competent mechanic install it, or get a pumpkin and swap that. I believe the going rate for the assembly is about 900 or 1000, and a complete pumpkin is around 2000 +.

What are the expectations when buying a complete pumpkin? Basically what I am asking is what is reasonably expected for what internally should be rebuilt / refurbished / replaced other than just the LSD assembly? What are we really getting for the extra thousand dollars?
You will pay at least $1000 for an LSD.

You basically have 3 options

1) M-factory - $999.99
2) Wave track - $1295.00
3) Quaife - $1493.00

The M-factory has optional bearings you can purchase in addition to gear.

There are several DIY's on this process.

You won't see a huge difference, if any, as a daily driver. If you drive your car in the snow, you will see a difference. Canyon carving and tracking the car, yes.

For the extra $1000.00, you are paying for warranty, work on installing the new gear, and probably replacing any parts that are worn etc. You are also paying for the piece of mind that you basically bought a brand new diff, and it's plug & play on your end.

If you are mechanically inclined and have the right tools, maybe don't pay the $1000.00.



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