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BMW uses 3 gear sets in all there cars for like the past 30 years.I highly doubt they will change that in the next M3.
Bmw uses 3 sizes of differentials. The 3 sizes are a referance to the diameter of the ring gear.
First the small 168mm differential, which is comonly found in the 4cyl chassies like E30 and E36 318, 2002, and E21 320 and 323.
The second or medium 188mm size is found in most 6cyl chassis. Such as E30 325, e36 325 328 323 m3, E36/7 318ti, also Z3 coupes, and roadsters,E46 325 323 328 also E30 M3, and E24 6 series.
Finaly the large Differential 210mm. This unit is found in all 8cyl, and 12cyl chassis. Like E32 740 and 750, E31 840 and 850, also E34 M5,E24 M6, and E46 M3.
If some one can conferm that a 335 uses a 210mm gear set you can bet your car an e90 M3 lsd will drop in.
how do you think all the people running around with 3.91s and 4.10s in there e46 M3s got them?Do you guys think that Dinan or some company made custom gears? lol they came out of old school 210mm cars like the 6 series and 8 series
All BMW differentials weather LSD or open use one of theese 3 sizes. The easiest way to tell what you have in your car is to count the bolts on the output Bearing race/ oil seal mount behind the output flange. This flange will have 4 bolts for a 168mm, 6 bolts for a 188mm, and 8 if it is a 210mm.
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