BMW 3-Series / Miata Axles?

[markocosic]

Q:

BMW E30/E36 (and others) rear differential. Anybody know what size joints these are/what the pitch circle is? Anybody know how much these diffs weigh? Anybody know what the spline pattern on the end of them is? (28 by what diameter?)

http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project...#5104332800624268290 (http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project/photo#5104332800624268290)
http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project...#5104332852163876050 (http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project/photo#5104332852163876050)
http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project...#5104332856458843362 (http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project/photo#5104332856458843362)

I'd like to run an E30/E36 "medium" size BMW differential with Miata uprights/hubsdriveshafts in a one-off vehicle if at all possible (Miata corners are convenient, but I need a tall ratio and lsd at sensible cost. Miata never relly made a tall ratio, and the specMiata folks nab all the lsds in short order anyhow)

[markocosic]

Q:

BMW E30/E36 (and others) rear differential. Anybody know what size joints these are/what the pitch circle is? Anybody know how much these diffs weigh? Anybody know what the spline pattern on the end of them is? (28 by what diameter?)

http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project...#5104332800624268290 (http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project/photo#5104332800624268290)
http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project...#5104332852163876050 (http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project/photo#5104332852163876050)
http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project...#5104332856458843362 (http://picasaweb.google.com/hugh.mccabe/BMWE30M3Project/photo#5104332856458843362)

I'd like to run an E30/E36 "medium" size BMW differential with Miata uprights/hubsdriveshafts in a one-off vehicle if at all possible (Miata corners are convenient, but I need a tall ratio and lsd at sensible cost. Miata never relly made a tall ratio, and the specMiata folks nab all the lsds in short order anyhow)

[jdstuff]

Email sent. http://fsae.com/groupee_common/emoticons/icon_cool.gif

[markocosic]

As far as I can gather they're a large lobro joint, and thanks to Jason the old "big six" differentials are 38kg/83lbs apiece.

[markocosic]

They're the 108mm OD, 94mm pitch circle Lobro joints on the "medium" BMW diff, with 84mm pitch circle on the input flange.

SW2007 model available if needed.

Miata driveshafts have a 4x100 bolt pattern on the ends. Not had it apart to chekc splines yet.