3.73 pricing question

fpa1974 · Jan 13, 2005

So this is the 3.73 diff year. I first need to buy a unit then I will send it away for a rebuild. So my question is about what kind of prices should I expect to pay for this 3.73 LSD (from an E30), and sources to get it from would be appreciated.

Thanks,
Florian

Ron Stygar · Jan 13, 2005

fpa1974 said:
So this is the 3.73 diff year. I first need to buy a unit then I will send it away for a rebuild. So my question is about what kind of prices should I expect to pay for this 3.73 LSD (from an E30), and sources to get it from would be appreciated.

Thanks,
Florian

As mentioned, I would go with the BMW TORSEN style 3.46 differential if using stock diameter tires. It's right on the edge of being aggravating on my car. Perfect for the way you drive the car. Look at the third gear numbers.
Approaching 98 MPH at red line and you get the Torsen style which hooks up better based on my experiences.

rader · Jan 13, 2005

Why not save yourself some time, buy a rebuilt diff, and then ship your core.
http://www.diffsonline.com/

Ron, I didn't know BMW had Torsen style diffs - I thought they were all clutch type. What cars did these come on?

Ron Stygar · Jan 13, 2005

rader said:
Why not save yourself some time, buy a rebuilt diff, and then ship your core.
http://www.diffsonline.com/

Ron, I didn't know BMW had Torsen style diffs - I thought they were all clutch type. What cars did these come on?

Dan is going to get me into SEMA next time as an employee.

The Z3 3.0 automatic uses the 3.46 Torsen style differential.
Part number 33 10 2 508 262.
Supposedly an M thing, but no data supporting that.

phrider · Jan 13, 2005

Ron Stygar said:
The Z3 3.0 automatic uses the 3.46 Torsen style differential.
Part number 33 10 2 508 262.
Supposedly an M thing, but no data supporting that.

Ron, what's the best pricing that you've seen on this diff?

MDork · Jan 13, 2005

fpa1974 said:
So this is the 3.73 diff year. I first need to buy a unit then I will send it away for a rebuild. So my question is about what kind of prices should I expect to pay for this 3.73 LSD (from an E30), and sources to get it from would be appreciated.

Thanks,
Florian

I paid $400 from a fellow couper (thanks eric!). I believe he sourced it from Double02 Salvage in CA (hayward i think). Others have paid as low as $200. The guts looked even cleaner than my 3.15 (with 17K miles on it). So far no complaints.

my coupe is not a daily driver...so the shorter gearing doesnt bother me at all. i have driven a coupe with a 3.46 and i much prefer the 3.73 with an s54 personally.

rader · Jan 13, 2005

Sweeet! That's good info. I'll have to see if I can dig one up.

Ron Stygar said:
Dan is going to get me into SEMA next time as an employee.

The Z3 3.0 automatic uses the 3.46 Torsen style differential.
Part number 33 10 2 508 262.
Supposedly an M thing, but no data supporting that.

rader · Jan 13, 2005

I'm showing 33 10 7 508 262 for the remanufactured 3.0 auto diff.

Ron Stygar · Jan 13, 2005

rader said:
I'm showing 33 10 7 508 262 for the remanufactured 3.0 auto diff.

You are correct.

Ron Stygar · Jan 13, 2005

phrider said:
Ron, what's the best pricing that you've seen on this diff?

When I purchased mine, retail was $2200 with a dealer net of $1386. Plus $100 if you want to keep your stock one and shipping for 82 pounds plus the packing. Call Jay and see what he will do. 800-530-0902. Pacific BMW too which is closer. Paul in FL knows how to pack them.

robrez · Jan 13, 2005

I'd like to do the 3.46 torsen on my car, which is a 3.0 Coupe, 5 speed. I know there's much to learn before it do this mod, so where do I get started in determing how it will affect my performance? I believe my car currently has 3.07 gears and I have Dinan software installed. Thanks for your help.

Pinecone · Jan 14, 2005

I think a 4.10 LSD from an E30 318is would be the trick.

CarlM · Jan 14, 2005

Non M cars

I know that this thread is focused on coupes and M cars. My questions are about 98 Z3 2.8? Has anyone changed to another ratio? If so what & why? Inquiring mind wants to know. Thank you for you imput and sharing of knowledge.
:angel:

Randy Forbes · Jan 14, 2005

Pinecone said:
I think a 4.10 LSD from an E30 318is would be the trick.

At the time I was shopping for a differential (12/01-01/02) it was a toss up between the 3.73:1 and the 3.91:1.

I'm completely happy with the 3.73:1, but I have to wonder what the pull would be like with the 3.91:1...

fpa1974 · Jan 15, 2005

Thanks for all the opinions and info guys. I am still not 100% decided on the 3.73 but I believe that this ratio is going to be the winner.

Florian

Pinecone · Jan 15, 2005

Randy Forbes said:
At the time I was shopping for a differential (12/01-01/02) it was a toss up between the 3.73:1 and the 3.91:1.

I'm completely happy with the 3.73:1, but I have to wonder what the pull would be like with the 3.91:1...

When I saw one for sale, I though the same thing. I think Mpire needs a 3.91 or 4.10 to go with the 6 speed.

DAS BOOT · Jan 15, 2005

Randy Forbes said:
At the time I was shopping for a differential (12/01-01/02) it was a toss up between the 3.73:1 and the 3.91:1.

I'm completely happy with the 3.73:1, but I have to wonder what the pull would be like with the 3.91:1...

I'll let you know this summer, 3:91 with euro 6 speed tranny, and dinan supercharger!!

yeeeehaaaaa

3.73 pricing question

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