The 3.55's will net you marginally better highway mileage, but 3.73's will likely net you better around town mileage. Also note that the "higher" gear ratio saltfish is referring to is a numerically higher gear ratio. When tossing the terms for rear gears around, "low gears" will refer to a higher number numerically. i.e 4:11=low, 3.08=high.
The term limited slip is often interchanged with the term positraction. Basically, there are clutches in the rearend that will distribute power to both wheels, rather than a single rear wheel. I would personally go with the 3.73's, but then again, if I tow anything its usually the wagon or the firebird.
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