Blazerowner...unless your wanting a lower gear you may want to keep those 3.73s..with your 4l80 od and a decent tire you may needem to keep your cruise rpm range good..I kept my 4.10s w/od and wouldn't even consider changing to higher gears..use one of the rpm calculators to figure your cruise rpm..here's one of many that are online...
http://spicerparts.com/calculators/e...rpm-calculator