Quote:
Originally Posted by Dr. Sternschnuppe
Type 201.126 (190 D 2.5).
1) Stadnard rear axle, without ASD and with or without ABS.- 5-speed manual transmisson - 3,64:1 (Crown wheel diameter 168 mm, oil volume 0,7 l).
- 4-speed automatic transmisson - 3,07:1 (Crown wheel diameter 168 mm, oil volume 0,7 l).
The "small" (168 mm/0,7 l) rear axle housing.
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2)Rear axle with ASD and ABS.- 5-speed manual transmisson - 3.67 (Crown wheel diameter 185 mm, oil volume 1,1 l).
- 4-speed automatic transmisson - 3.07 (Crown wheel diameter 185 mm, oil volume 1,1 l).
The "mid size" (185 mm/1,1 l) rear axle housing.
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3) Rear axle with or without ABS, for version "TAXI", code 450, from 11/1988.
From chassis Nr. WDB201XXXXF561385, produced only on Bremen plant.- 5-speed manual transmisson - 3.67 (Crown wheel diameter 185 mm, oil volume 1,1 l).
- 4-speed automatic transmisson - 3.07 (Crown wheel diameter 185 mm, oil volume 1,1 l).
The "mid size" (185 mm/1,1 l) rear axle housing.
Ciao! 
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It appears all three graphs depict mine as a 3.64:1 "small" diff.
So I guess now the question is what can PHYSICALLY bolt up? I imagine the flanges are the same on most of them, even with larger housings...
I'm not going to find another of mine, so I need the next best thing that's readily available. Does anyone know what will work if mine is #1 in the last list? I'm guessing I need something with the same crown wheel diameter? Anything else have 168mm?
also: I am curious how it's a 3.64 yet today I noticed at 70 MPH I was turning around 2,600 RPM's...
My M3 has a 315 with 1:1 final is about 3,100 RPMS at 70 MPH...