How much difference will it make?

Dana67Dart said

I'm no drag racer, but my gut says your rear gear at 4.10 is too much, taller tires or smaller gear.

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He's running the a500 overdrive. It should tame the 4.10 gear. I would leave the gear. I run 3.91's with a 727 and to me seems fine. 28" rear tires help in my case. However, highway driving is limited for my liking.