If its going to spend a decent amount of time on the highway, I would stick some where around a 3.42 rear gear. If you want to get a close estimate of what ratio you currently have, jack up the rearend of the car. Mark the driveshaft and tire, count how many times you have to rotate the driveshaft to get the tire to rotate once. Example, if the driveshaft rotates approx. two and three quarter times when the tire has gone around once, then you have a 2.73 rear gear. There are aftermarket pieces that you can put in place of the spider gears to make it a cheap locker, but they are noisy and chatter on turns. If its going to be a street car, find a limited slip unit. Good luck with your build.
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