Need Differential Rebuild Recommendations

[///M3RIC]

Is this Pedro the best source for R&P? I’m considering either 3.91 or 3.85. What’s the going rate for those?

[bigjae46]

Is this Pedro the best source for R&P? I’m considering either 3.91 or 3.85. What’s the going rate for those?

Don't think so. A 3.91 was $1200 the last time I checked. You can get a 3.85 from a manual E9X M3 - I think about $400 was the market price.

[Daniel]

+1 to Pedro.

I was recommended by him through a track friend and I’ve been running his ZF diff since February. I’ve used it through multiple track days already and it’s a great upgrade.

[///M3RIC]

Don't think so. A 3.91 was $1200 the last time I checked. You can get a 3.85 from a manual E9X M3 - I think about $400 was the market price.

Where can I find a 3.85 for $400? Everywhere I’ve looked has them for ~ $1,000

[bigjae46]

Where can I find a 3.85 for $400? Everywhere I’ve looked has them for ~ $1,000

M3Post should have some used. A lot of those guys will swap in a 4.10 or a 4.44.

[ThatDudeZac]

ThatDudeZac which shop are you going to use? I’m in DFW as well.

Sorry for the late reply but I went with gsr Motorsports! They specialize in bmw track cars and pricing wasn't terrible! Finished my rebuild in about a week!

[liam821]

Figured I'd ask while you're all here. I'm swapping to a 3.25 FD (H64 210mm) from an older e32/e34 into my e46 M3 diff because I'm converting to an e92m3 DCT "short ratio" transmission - 7th gear is 1:1. I was going to use the racingdiff gear ratio swap kit and hand both the crown and pinion and racingdiff kit to _somebody_ here in the PNW to do the actual work. I don't have the tools (or patience) to do the finicky bits.

Can anybody recommend a shop in the PNW to do this work? I guess I should ship it down to Texas too... Thoughts? I've already sourced the 3.25 crown and pinion.

[George Hill]

Just had a client use Syncro Design Works and he had a great experience.