E36 Bullet-Proof Differential ConversionDescription Convert your E36 rear differential to a 210mm ring and pinion differential from the 7 Series. The US E36 (M3 and 325 328) differential uses a 188mm ring gear. The Euro M3 used a 210mm ring gear which has been proven to be stronger than the standard US M3 differential. This bracket makes it possible to bolt in a differential from the E32 750i (or E34 M5) which has a 210mm ring gear. These differentials are commonly available in 3. 15
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