The first setting on the TR is Normal Mode or "Special Programs off". Only thing of importance to remember here is that your LR3 is still in full time 4x4 with an even 50-50 split of power (front to back) when this is selected.

Second setting is Grass-Gravel-Snow. It is probably the most misunderstood setting of them all. Because it has the word snow, most people assume that it is the best setting to use in the snow and this is simply a mistake. It is intended to be used on hard packed surfaces that can be expected to be very slipery such as an ice covered road (not trail), the interstate during a rain storm, wet grass, and so on. It will cause your transmission to start out in 2nd gear (3rd gear when in low range). Will remove some sensitivity from the gas pedal and will become very agressive at looking for and controling wheel spin. It will also remove some articulation in an effort to maintain better control. Never, ever use this setting during off roading. It is conter-productive to do so.

Next is mud-ruts. This setting allows the transmission to start in first gear even when using low range, thus allowing more torque to make it where it is needed. It will increase articulation and be a little more forgiving of wheel spin. Use caution if off roading in low range in this setting as it is a very strange feeling to be in first gear/low range until you get used to it. Better suited for mud, ruts, pot holes, gravel covered trails, snow covered trails, great setting for most off road situations with the exception of the next two.

Sand mode. Use it for what it is intended. It is the best setting for the deep, sugar sand like a trip to the beach. Dog-gone californians will not let me take my LR3 to any of the thousands of miles worth of coast here except for Pismo Beach . It will cause your transmission to "hang on" to the lower gears longer before allowing for an up shift. That translates into more torque, something essensial in deep sand to keep the tires moving. It will also desensitise the DSC even further to allow for some wheel spin, all in an effort to make sure you keep forward momentum.

Finnaly is rock crawl. It will greatly remove control from the gas pedal, will allow for the greatest amount of articulation and will force the vehicle into Low Range. Use mainly for what its name implies.