Need Differential Rebuild Recommendations

[George Hill]

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

[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.

[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!

[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.

[///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

[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.

[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.

[///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?

[ThatDudeZac]

Is Pedro in Portugual? My buddy bought a ZF unit off of eBay from a guy in portugual. Reasonable priced and is working great!

Yup its the same dude I believe! And yea after he told me the price I was like sold lol, have seen his name referenced multiple times here and on other posts and some Facebook posts as well so figured I can't trust him, he also accepts PayPal goods and services so usually that's pretty solid

[bigjae46]

Yup, that's him. Buying directly from him is cheaper than the ebay listings fyi

I think my buddy paid $900 for a ZF unit. I remember thinking it might be a ripoff but he said YOLO. Worked out well. Had a customs issue which delayed things. Otherwise it was great. It shipped with new carrier bearings which I'd rather install those myself since they will likely get beat up in shipping.

[siamkazi]

Is Pedro in Portugual? My buddy bought a ZF unit off of eBay from a guy in portugual. Reasonable priced and is working great!

Yup, that's him. Buying directly from him is cheaper than the ebay listings fyi

[EthanolTurbo]

Are you talking about for turbo cars or NA cars? What's the price difference?

For either. I think Drexlers range from 1800-3000ish USD.

[bigjae46]

Just updating the post! I ended up going with Pedro (PeakyParts) he sourced me everything to do my upgrade (3.91 ring and pinion, zf lsd with upgraded clutches and ramps, bearings and shims) all for just over 3k shipped to texas 🤠 I'm just waiting for them to arrive and send the car off to a local shop to get it all put together!

Is Pedro in Portugual? My buddy bought a ZF unit off of eBay from a guy in portugual. Reasonable priced and is working great!

[Bob Sacamano]

Just updating the post! I ended up going with Pedro (PeakyParts) he sourced me everything to do my upgrade (3.91 ring and pinion, zf lsd with upgraded clutches and ramps, bearings and shims) all for just over 3k shipped to texas 🤠 I'm just waiting for them to arrive and send the car off to a local shop to get it all put together!

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

[ThatDudeZac]

Just updating the post! I ended up going with Pedro (PeakyParts) he sourced me everything to do my upgrade (3.91 ring and pinion, zf lsd with upgraded clutches and ramps, bearings and shims) all for just over 3k shipped to texas 🤠 I'm just waiting for them to arrive and send the car off to a local shop to get it all put together!