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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jun-05-2018, 09:35:32 PM   #11
M3Dom
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Default Re: Diff upgrade

my 410 motorsports diff was the best mod other than my supercharger ive done
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Old Tue, Jun-05-2018, 09:48:25 PM   #12
ethan
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Default Re: Diff upgrade

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Originally Posted by Loi-Spec View Post
I might have some extra timken bearings and stuff I didn't use when I gathered parts. But the list of parts are necessary and someone who has experience with diffs. The backlash settings of over tightening is a big deal and you'd get whine.

I got lucky with mine and didn't need any spacers
I also got lucky: went from stock pumpkin to 3.91 R&P and Diffsonline 3-clutch BMW LSD, and though I had to adjust the carrier shims, the factory pinion depth shim was correct.

I agree that the easiest way to screw it up if you don't know diffs is to mistorque that crush sleeve and change its length. I had my shop determine the appropriate length and then fabricate a solid replacement for my setup so I don't have to worry about it in the future.
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Old Thu, Jun-07-2018, 10:31:00 PM   #13
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Default Re: Diff upgrade

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Originally Posted by M3Dom View Post
my 410 motorsports diff was the best mod other than my supercharger ive done
are you running 4.10 gears with supercharger ?
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Subframe Reinforced by Active Autowerke / HSD Coilovers /Apex ARC-8 / Michelin PSS / 4.10 Motorsport Gears
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Old Sun, Jun-10-2018, 08:29:04 AM   #14
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Default Re: Diff upgrade

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Originally Posted by marioec View Post
are you running 4.10 gears with supercharger ?
Good question. With an SC, you would want longer gears. Not shorter gears if I'm not mistaken?

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Old Sun, Jun-10-2018, 04:23:31 PM   #15
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Default Re: Diff upgrade

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Originally Posted by E30toF30 View Post
Good question. With an SC, you would want longer gears. Not shorter gears if I'm not mistaken?

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Yeah you'd want to stay longer, otherwise you'd spin tires easily.

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Old Sun, Jun-10-2018, 09:41:55 PM   #16
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Default Re: Diff upgrade

I got mine rebuilt and re geared (3.91) by diffsonline. I like it a lot clunk got really better, however it whines more than I would want it to. When I am of throttle at 60-90 it does... I contacted them they told me that they do on average like 2 btw diffs a day, so there is cannot be any mistake from their side. They blame my poly bushings. Also they offered to send it back for inspection shipping at my cost both ways and if they find that diff is fine they will charge me for the labor! So Streamline might be not that bad hehe :-). Here is my story. performance wise it is great. 3.91 great and rebuilt LSD unit was such an improvement.
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Old Sun, Jun-10-2018, 10:37:56 PM   #17
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Default Re: Diff upgrade

The bushings cause whining. So I opted for OEM.
For all motor setup, the 4.10 is really nice, but street driving, it definitely sounds like the motor is working harder, but you just need to shift early. LOL
I also skip from 4th to 6th when i'm on the freeway, so you basically just have 5 gears now lol
I lost 1mpg average so far on my travels.
It's a costly upgrade, but worthwhile.

I have a faint decel in whine in 60mph, but it doesn't bother me. I never experienced a major clunk issue, other than diff bushings going out.
Also change your guibo and center bearing bushings on your driveshaft while you're there. Just my opinion.

My friend who helped me on this project said, the hardest thing was the backlash. And there's minimal amount of DIYs out there.
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Old Mon, Jun-11-2018, 04:13:17 PM   #18
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Default Re: Diff upgrade

Bushings don't cause whine.
Gear mesh causes whine.
Hard bushings just telegraph it into the cockpit better.
Properly set up new gears should be just as quiet as any full size older American car... it's just not there.
Used gears are a lot more likely to be noisy, they've already worn together and the odds of putting them back into the exact same spot are small.
I wouldn't bother sending it back to D.O.L. They'll check backlash and contact pattern and say: "Nope. Nothing wrong here."
And any shop that says "We couldn't have made a mistake" just made a huge one right there.
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Old Tue, Jun-12-2018, 10:06:16 PM   #19
M3Dom
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Default Re: Diff upgrade

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Originally Posted by marioec View Post
are you running 4.10 gears with supercharger ?
yes .
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Discussing Diff upgrade in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)