Sounds like you need to change the rear gear ratio.. You will then have easier less stressful starts and actually be able to use 5th. Do the Math when the tires are mounted on the car measure your tire height get your rear gear ratio and look up the transmission gearing ratios get to calculating many online tools to help you there and find out what speeds each gear will be used for. Changing the Diff gear is easy compared to the swap you already did or bring it to have someone do it for you gears are cheap and its an easy job.
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