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      09-16-2018, 02:51 PM   #1

Drives: 2011 335i
Join Date: Aug 2014
Location: DFW

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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, 03:43 PM   #2
335e92tx's Avatar

Drives: Was 07-335e92 - Now '13 335IS
Join Date: Mar 2008
Location: Texas

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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

Apr'17 - '13 335IS replaced the '07 E92
IS mods-MFactory LSD.MHD/BQ Tuned.ATM-IC.AFE Momentum GT.Konis.Mfront&rear arms and rods

Last edited by 335e92tx; 09-16-2018 at 04:13 PM.
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      09-16-2018, 04:07 PM   #3

Drives: 2007 328i
Join Date: Sep 2010
Location: Vancouver bc

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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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