Started at 9am, and got done around 3 pm. Not that hard of install, then again, I was just learning (Im 18 haha) and watching my Uncle and Dad do mostly all the work :ass3:. Shifts a little harder, but I was expecting more. Does it have to break in? Overall Im pretty satisfied. I can't wait for the 4.10s to be installed next week though, along with my new ratchet shifter 8)