don_w

discofan... there won't be much difference in the RPMs between 3.73s and 4.10s. Here are the calcs (for a 27" tire, in overdrive @ 80mph, w/auto trans):

(3.31 X 0.75) X 80mph / 27" / .002975 = 2,472 rpm [stock]
(3.73 X 0.75) X 80mph / 27" / .002975 = 2,786 rpm
(4.10 X 0.75) X 80mph / 27" / .002975 = 3,063 rpm

I also did a "test" to determine whether or not 3,000 rpm felt too high. I turned off the OD while cruising on the freeway, and when the tach was at ~2,800 rpm, I clicked on the cruise control for a minute or so. Then I did it at ~3,000rpm. The difference was negligible. To me, it didn't seem to be a problem at 3,000 rpm. But, I recommend you try it for yourself to see if 3.73s or 4.10s will work best for you.