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well you'll find that the car is slower with the 3.90 gears, but if taking the diff. assembly out and pulling just the differential and ring is not too difficult. Then you can replace the open diff. with LSD diff by just unbolting the 3.90 ring from the LSD unit and attaching the 4.10 ring to it. Then replace the LSD / 4.10 into the diff. assembly w/ pinion with the 4.10
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