I've been looking for diff alternatives for my E46 M3. It has the large case, 210mm differential, with 8 bolts on each side. (Medium, 188mm cases have 6 bolts.) Basically it's all the "big" 6 cyl, the v8 and v12 cars. I started compiling a list of other models with the large case. Originally I wanted to find a cheaper alternative to find a 3.91 or 4.10 rear, it's been tough to find and I'll probably just end up purchasing a new, built unit with a true LSD. Anyway I figure that a list like this could be useful to someone else so why not post it up? Feel free to confirm or correct me, also if you know the correct gearing I'll update it as necessary.
Large 210mm Case BMWs:
-E24 M6
-E31 850 (auto 3.64)
-E34 M5 before 6/94= 3.91
-E36 Euro (w/3.2l) M3
-E38 730, 740 (V8s), 750 (v12)
-E39 535, 540, M5 (all V8)
Last edited by richATTK; 05-06-2013 at 11:58 AM.
What are e65 / e66 diffs? Can we use them?
E34 540 and E32 740 and 750 also used the large case diffs; not sure of the ratios.
AFAIK,,,, these ratio are available in a 210mm casing
and here are some cars that have these ratio
2.65... US 850 ONLY (afaik)
2.93. E32/E34 V8 4.0 and 850 CSI and E23 745
3.07. E28 M535 and E23 745
3.15 E32 750 and 850
3.23 E34 M5 3.8 6g and E36 Euro M3
3.45. Euro E34 535 and E32 735 and E23 735
3.64 Euro E34 535 E32 735 and US 850 (maby also US 750 E32)
3.73 Euro E32 735 and US E34 M5 and E28 M5
3.91 E34 M5 and Euro 735
there may be other cars with these ratio ,,but this came in my mind
Sveinbjörn Hrafnsson
E30 CABRIO V12 M70B50 ///
ALPINA B10 BITURBO 346 @ 507
ULTIMA Evolution
Contacts
http://alpina.123.is/pictures/
bumping this because it's great info!
I can get a 97 740iL diff for 20$ if I go pull it. Assuming its a shit ratio, but I can buy different ring and pinion for a few hundred and a mount kit from rallyroad and be good to go? Or only the e32 750i's?
You are not the first person to ask such a question. If the answer was yes, you would be reading about it.
What about the E46 M3 and the E9x M3 and the E60 M5. What size diff do they have?
Thanks
here worldwide list E32, all diff sizes:
730 iA from 09/88.......: 4.10
730 iA Switzerland......: 3.64
730 iA Switzerland from 09/89....: 4.10
730 iA Australia /Japan..........: 4.27
730 i M60 engine..............: 3.15
730 il M60 engine.............: 3.15
730 iA M60 engine.............: 3.23
730 iAL M60 engine............: 3.23
735i..........................: 3.45
735 iA........................: 3.45
735 iA from 09/88.............: 3.91
735 iA Switzerland from 09/89.: 3.91
735 iA Australia..............: 3.64
735 iA Australia from 9/89....: 3.91
735 iA USA / Canada / Japan...: 4.27
740iA.........................: 2.93
740iAL........................: 2.93
750iA.........................: 3.15
750iAL........................: 3.15
750 iAL USA / Canada / Japan..: 3.64
other cars ratios here from http://www.vinesauto.com/diffratio.htm
pics/dimensions, bolt sizes/pattern
http://www.bimmerboard.com/forums/posts/793828
http://www.bimmerboard.com/forums/posts/794017/
BMW Differential Tutorial, with pics. https://www.bmwfanatics.co.za/showthread.php?tid=1374
Type 188 cars:
All E36 models, except the 3.2lt M3.
All E30 6cyl models.
All E34 models, except the M5 and 540i.
All E32 6cyl models.
Type 210 cars:
E46 M3 and E36 4door M3.
E34 M5 and 540i.
E32 740i and 750i.
All E38 models.
E39 V8 models, could be all models but not sure.
Shogun tricks and tips for the E32 series are HERE!
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