Thanks for your reply. I am at about 480RWHP right now. I have a blower, cams, 3500stall, headers, and a 4.10 gear. I think I might not be able to get thru the quarter much under 7000RPM and was thinking if I go to a higher gear I might as well bite the bullet and build up the rear end at the same time becouse I was planning to build the motor next winter. Do you think 3.73 or 3.90 gears?