You know Ken, I'm not sure if the limited slip was even an option, but for some reason I seem to remember that it might have been on the 2005/2006 Tundras. You can always call a Yoda dealer with the VIN number and they should be able to tell you: 1) whether it was an option on that year model; and 2) if so, whether yours has the limited slip or not.

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2007 Tundra Limited Double Cab 4x4 Super White
Volant CAI
Pioneer AVIC Z-2 (hard drive upgrade to AVIC Z-3)
Key FOB Tailgate Lock (courtesy of Toxarch)
OEM back-up camera w/flip down monitor microswitch mod
Sirius Satellite Radio
WeatherTech Floor Liners
20" OEM alloy wheels
Line-X Bed liner
UWS Black Powdercoat Low Profile Toolbox
DU-HA underseat storage unit
JC Whitney Black Nerf Bars
Lund Interceptor II Bug Shield
Tekonsha Voyager Brake Controller