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Originally Posted by TacomaGA
Good question. Also, why do you have to actually switch the LD on in the Tacoma when you don't have to in the Tundra? The Tundra's is always on.
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I am gonna try to answer your questions and I am sure Deepstealth or someone will correct me if I am wrong.
The feature you have on your Tacoma is an electric locking rear differential. This unit is not the same one offered on the Tundra. The Tundra has an option that is a limited-slip differential. The difference being that the Limited-Slip in the Tundra is activated when a rear tire looses traction. This pressure causes the opposite tire to effectively lock in place and move the vehicle forward or backward.
The Locking differential featured in your Tacoma is a manually activated unit. When the button is not pushed, and the locker is not engaged, your rearend operates as if no traction control device is present. Only when you engage the locker does it start working. The electric locker makes both wheels spin at the same time, and same speed. It "locks the wheels together" and takes no pressure or rear slipping to make it work. The unit you have is better suited to offroad conditions than a limited-slip is.
As far as what the manual says, you do want to be at a stop or near crawl when you engage the locker. But once the locker is engaged, you can drive on it at increased speeds without any harm to your drivetrain. Just don't make the mistake of cruising on the interstate at 70mph and then hitting the button.
Clay