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So you think even the 3:55 gears will be a pain on the highway? Maybe I should just do the transmission gear swap and keep the 3:23 gears. Man, this is a tough decision...

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3:55's are 10% deeper than the 3.23's you have now. Put a piece of stock across the top of one of your rear tires and measure down to the ground then borrow a pair of 14" wheels/tires from a buddy for a day that are 90% as tall as your current 15's & take it out for a highway spin & you'll know how the 3:55's are gonna feel. If all good then borrow some shorter ones yet & see if 3:91's sound like a plan EDIT & if the ones you borrow ain't exactly 90% just do the math & see what you get & measure their height for this after you get em on the car/down on the ground