71, I have I agree that the 3.55 gears really add some snap (especially once you fix your tuning problem) but if you do a lot of highway driving, try a simple test before you put them in - drop down a gear and drive with rpm in the 3000-3500 rpm range. This is what you will be doing in the 65-75 mph range. Now imagine doing that for 1/2 hr. (This assumes you have a 1:1 top gear ratio.)
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