E36 M3 diff ratio ?s

[eevans@xxxxxxxxxxx]

Someone ask me the other day what differentials would work on a '99 M3. I'm 
not even sure what the stock one is much less what's available or 
compatible. What ratios and what cars would he look to for a compatible 
lower geared diff? He ask if there was a 3.73 available, is there and what 
car(s) would be a donor? If not a 3.73 how close to that and what would the 
cost for a low mileage good diff be? What should he expect to pay to have 
it installed? Is the stock M3 diff worth anything as a trade or just an 
upgrade for another car?

TIA

Evan
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