I'm thinking of buying an 80k mile 3.64lsd for $500 + $50 s/h (usd) from an E32 735i, to replace my current 3.46lsd. Is this a worth while upgrade from the 3.46? I'd like to do anything to get shorter gears and faster acceleration, especially on the highway. It seems most people who do this upgrade start out with a 3.46 open diff. I really don't think I want to go with the 3.91 becuase I'm not tracking the car, and still need to get a few miles per $2.33/gallon of gas.

If this isn't really that worth-while of an upgrade - I'll just save myself some time and do my suspension...If I do the differential, I'll do it in the next few weeks - and then do suspension late june. If I do suspension first, I'll do the suspension mid june, so not a big difference.

So really long post short, after the $350 i can get for my current differential... is the 3.64 worth my $200?