4.10s...while you wait. I've talked to the Kahuna (I believe that's a priest) at Hooper's (The diff. shop), and he said the install of the gears is about three hours, a little more if you replace bearings and seals. I'm sure an appointment is necessary. I may be able to get him to give us a break because of the number of local guys that are going to have the gears installed. I'll be talking to you, Mark