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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 Mon, Aug-20-2018, 06:17:02 PM   #11
sddynamix
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Default Re: Digging into the Diff Rebuild

Also - related - if it helps anyone, Bobby Rahal has 4.10's for $786. Just placed my order!
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Old Tue, Aug-21-2018, 01:45:25 PM   #12
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Default Re: Digging into the Diff Rebuild

diffsonline.com

Just had them build a 4:10. great product, very happy with it.
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Old Tue, Aug-21-2018, 01:56:51 PM   #13
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Default Re: Digging into the Diff Rebuild

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diffsonline.com

Just had them build a 4:10. great product, very happy with it.

Thats your gears... did you have them touch the LSD though?
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Old Tue, Aug-21-2018, 02:00:07 PM   #14
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Default Re: Digging into the Diff Rebuild

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Well your LSD is toast at this point, so if you would like a working LSD (which is a huge deal btw), you should get a whole new diff from diffsonline or have yours rebuilt, but def with a new or reman'd M-LSD. There are other types of LSDs out there though, so do your research. I'd also shop around more on the shop that rebuilds it. Look at off road truck shops. A diff is a diff.

Not sure what you saw about our LSDs being bullet proof. They have a life of around 100k like a lot of things on this car. the Diff itself, like the tranny, is pretty bomb proof, however, and 75w140 is a nice heavy oil (upgraded from 90weight from e36)
What are you using to determine when it's shot?

I keep expecting mine to be shot, but it feels like it isn't-- drifting is still easy, all burnouts are two tire burnouts, putting one tire on ice still results in the car accelerating, etc.
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Old Tue, Aug-21-2018, 02:48:38 PM   #15
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Default Re: Digging into the Diff Rebuild

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Thats your gears... did you have them touch the LSD though?
I had a dinan 3.9 that was junk. Bought M sport ring and pinion, had 35/65 ramping and 3 plate clutch disks along with polishing. Can pulls like crazy coming out of corners and I can really put the power down. It is the best mod for this platform. Period. I should have done it years ago instead of buying a piece of shit Dinan diff. Diffsonline was local to me so that helped as well, they do great work. Zero complaints and really satisfied with the product.
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Old Tue, Aug-21-2018, 04:19:44 PM   #16
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Default Re: Digging into the Diff Rebuild

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What are you using to determine when it's shot?

I keep expecting mine to be shot, but it feels like it isn't-- drifting is still easy, all burnouts are two tire burnouts, putting one tire on ice still results in the car accelerating, etc.
Sounds like it can't be expected to do any better than that...
Except for that nasty clunk!


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Old Tue, Aug-21-2018, 04:30:11 PM   #17
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Default Re: Digging into the Diff Rebuild

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I had a dinan 3.9 that was junk. Bought M sport ring and pinion, had 35/65 ramping and 3 plate clutch disks along with polishing. Can pulls like crazy coming out of corners and I can really put the power down. It is the best mod for this platform. Period. I should have done it years ago instead of buying a piece of shit Dinan diff. Diffsonline was local to me so that helped as well, they do great work. Zero complaints and really satisfied with the product.
Which one did you go with 3.91 or 4.10? Looking into doing the same. Worried if I do 4.10 with a five speed swap I'll be speed limited at some tracks... maybe WGI?

Anybody priced out a Performance Gearing diff? No pricing info on the website.
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Old Tue, Aug-21-2018, 04:33:13 PM   #18
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What are you using to determine when it's shot?

I keep expecting mine to be shot, but it feels like it isn't-- drifting is still easy, all burnouts are two tire burnouts, putting one tire on ice still results in the car accelerating, etc.
It doesn't hook up out of corners for me. I can't get on the gas as early as some of the Porsches, or the rear end just starts going. Not sure if that's because of the design or the diff isn't working anymore. But, at one corner on Putnam, after heating up the Nittos, it felt like the car was going into limp mode, with power exiting out of the inside tire. I could hear and feel it, so I think it's on it's way out. Not sure how old the diff is, think PO said it's been replaced.
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Old Tue, Aug-21-2018, 04:37:00 PM   #19
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Default Re: Digging into the Diff Rebuild

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Originally Posted by CrookedCommie View Post
Which one did you go with 3.91 or 4.10? Looking into doing the same. Worried if I do 4.10 with a five speed swap I'll be speed limited at some tracks... maybe WGI?



Anybody priced out a Performance Gearing diff? No pricing info on the website.


Just picking the options he listed, its about $5800, though you do get back a core charge. Also, i cant tell if the 4.10ís are the actual performance or their version, but i bet theyre still good


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Old Tue, Aug-21-2018, 04:37:31 PM   #20
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Default Re: Digging into the Diff Rebuild

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Originally Posted by CrookedCommie View Post
It doesn't hook up out of corners for me. I can't get on the gas as early as some of the Porsches, or the rear end just starts going. Not sure if that's because of the design or the diff isn't working anymore. But, at one corner on Putnam, after heating up the Nittos, it felt like the car was going into limp mode, with power exiting out of the inside tire. I could hear and feel it, so I think it's on it's way out. Not sure how old the diff is, think PO said it's been replaced.
rear engine weight is going to get Porsches on the power sooner, all else equal/healthy.
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Discussing Digging into the Diff Rebuild 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)