.

[enjoy_m3]

ATB, mind me asking what shop did the work on your diff? I'm looking around for shops that can help with backlash adjustment.

Or if Bigjae46 has any tips and tricks on how to check the backlash and pinion pre load.

[ATB88]

I want to go from 4.10>3.91 but what you just described is what has me 50/50. Probably just send the R&P to Diffsonline.com and have them do it, around $1300 iirc.

Although for the price one could grab this R&P and re-sell at cost if the installation isn't practical.

Yeah I mean diffsonline isn't a bad route. But also just call around a few shops in the area and ask around about it. I wouldn't be surprised if it's easier to find a place willing to do it in less densely populated areas. I feel like all these places in LA become specialized in more "mainstream" repair work not because they can't do more complicated stuff but because they have enough customers that they can just choose what they will/won't work on because they'll still have a full schedule and just assume you can find someone else in the city to do it if they think it's a PITA. Whereas I'd expect shops in less dense areas to be willing to take on more things if they can do it just to be able to have the work. Honestly really curious if others have experienced the same difficulty finding someone to work on their diff as me or if LA's just weird ¯\_(ツ)_/¯

[bigjae46]

I built my own diff. Not the easiest thing to do because there’s very little info. If you have a press, dial gauge, beam torque wrench...then it’s something that can be accomplished with some patience.

There is going to be some adjustment if you’re swapping in a 3.91 or 4.10 so you’ll need shims and there will be some trial and error. The LSD carrier isn’t exactly light or easy to handle.

It can be done. I wouldn’t call it difficult...just requires patience.


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[Cubieman]

For those planning on having a local shop do the install, I recommend finding a place that is guaranteed that they'll do it (and for a good price) before committing. In my (limited) experience finding a place willing to do rebuild work on an M diff isn't as easy as you might expect. I had a hell of a time finding a place that would do it in LA. Almost every BMW place that got recommended to me told me that they don't do it anymore because it's not worth their time for what they'd charge because it's so finnicky. Standard transmission/diff shops didn't want to touch it because it was BMW/M. I only ended up finding one place in the LA area that would do it, and they charged a lot (wanted $600-$700, diff already out of car and parts provided by me, to do pinion and output bearings/seals, no ring and pinion swap or anything else).

This is super dependent on where you live, of course, but before my experience I just kind of assumed that of course I'd be able to find a place that would do my diff around here. Turns out it wasn't easy even in a huge city. Ymmv.

I want to go from 4.10>3.91 but what you just described is what has me 50/50. Probably just send the R&P to Diffsonline.com and have them do it, around $1300 iirc.

Although for the price one could grab this R&P and re-sell at cost if the installation isn't practical.

[ATB88]

For those planning on having a local shop do the install, I recommend finding a place that is guaranteed that they'll do it (and for a good price) before committing. In my (limited) experience finding a place willing to do rebuild work on an M diff isn't as easy as you might expect. I had a hell of a time finding a place that would do it in LA. Almost every BMW place that got recommended to me told me that they don't do diff work anymore because it's not worth their time for what they'd charge because it's so finnicky. Standard transmission/diff shops didn't want to touch it because it was BMW/M. I only ended up finding one place in the LA area that would do it, and they charged a lot (wanted $600-$700, diff already out of car and parts provided by me, to do pinion and output bearings/seals, no ring and pinion swap or anything else).

This is super dependent on where you live, of course, but before my experience I just kind of assumed that of course I'd be able to find a place that would do my diff around here. Turns out it wasn't easy even in a huge city. Ymmv.

[HighOnLSB]

Clicked through the options too fast on the site and accidentally committed to 4.10 gears.

Would be interested in 3.91 instead, also curious how payment will work for this group buy.

[enjoy_m3]

Can someone remind me, the e9x and e46 m3 R&P are interchangeable right? I have a friend with a e9x m3 that may be interested in a 3.91.

Also, I might be able to provide a bearing package if you guys are interested (koyo bearings). I can look into it

[Actuary]

Add me to the list for 3.91

[Randall921]

3.91

1. Bigjae46
2. Bigjae46
3. robgill
4. Heirforce1
5. Randall921

[Cubieman]

What's the best place to get new bearings/rebuild stuff?

Diffsonline.com seems to be a popular choice.

Edit: Read that too fast, they are good for full rebuilds, maybe not individual parts.

[EthanolTurbo]

Depends. You can just slap the R&P in and reuse the bearings - $200-$400.

Add about $200-$400 for bearings.


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What's the best place to get new bearings/rebuild stuff?

[bigjae46]

Out of curiosity, what is a reasonable price range for installation labor?

Depends. You can just slap the R&P in and reuse the bearings - $200-$400.

Add about $200-$400 for bearings.


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[maupineda]

Please sign up directly on the GB for 4.10: https://euroconnex.co/products/forge...ears-pinions-1

I took a spot. I think you need to add the E85/6 chassis, and post in ZPOST forum too.

[bigjae46]

Do they require sponsorships? I had no idea E46fanatics was still around!

No idea. E46F is still around although I never spend time there.


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[Cubieman]

Interested in 3.91, when is payment due?