High all. I just purchased a 05 Access Cab Tundra. I traded my tacoma in that had the TRD package to include the Rear Locking Diff. I'm trying to figure out if the Tundras come with a LSD standard on all 4x4 models or is it an option. The manual talks of a auto LSD button (which is not on my truck). Some of the trails i like to take here in Southern AZ required my locker in the Tacoma. I like to Off Road but would hate to not be able to take some of my trails anymore . Can anyone help? And if The truck doesn't have a LSD, anyone know of a inexpensive locker thats easy to install?