I would say if you are going to 3.27 or 3.55 don't bother, the labor to install it is not worth the gain you get. 3.73 is reasonable. If you are concerned about fuel economy just stay with stock.
i just put 3.55s in my LSC. drives like the car should from the factory. just a little more power off the line and at low range. doesnt seem so weak down low anymore.
i might try some 3.73s this week (less than 90 minutes to drop the diff, install gears, and reinstall diff)
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