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has anyone used a 3.91 ratio diff before in an e36 3.2 euro m3? and what was your pros and cons and what diffrence did it make on the 1/4mile??
:eek:hnoes
 

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A 3.38 LSD would be perfect, but you can only get a 3.46 LSD if you special order it, and that will cost you like $1700.

If you use your car as a daily driver, stay mild. A 3.91 LSD would
probably make you car a monster, but at 80mph you will be taching around
5000 rpms. The M3 tach is already high stock.
 
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