What year is your Tundra? Did you add the locker aftermarket? Tundra's pre-07 didn't come with a locker (as Nikita said), sounds like you have a limited slip differential. According to Toyota.com the 07's don't have a locker either.....if it does I missed it.PECHOSH1816 said:I have a tundra std cab V8 A/T and I have it. I spin both rear tires all the time. I can leave two dark tread marks on the street!