That's right, establish your pinion depth then set the carrier. Big Chief is correct, once everything is set, check the pattern. I ran a 4.11 gear on the street for many years. Still running a 3.73 but with now with OD. (ok, I'm not quite as old school as I used to be...) I drive my cars a lot. That 3.90 will make a lot of heat especially when fresh. Break it in gently. I'm a fan of power steering. A tall gear (sustained RPM) and the small PS reservoir will cause the oil to bypass back to tank more than normal creating heat. If you drive the car a lot, especially at speed, think about adding a PS oil cooler. Like my crew says, "You had to have a Hot Rod" ...it never ends. Upgrade this, have to change that... it's a sickness! Let us know how you make out. Thanks
