• On dry pavement - Never. You’ll lose all ability to steer.

• On pavement with snow and ice - whenever you think there is a need to keep the tires from spinning. Especially when the surface is uneven, loss of traction is likely. In snow an inch of downtravel of one tire could result in a spinning tire. So, as a good driver you should engage the locker(s) proactively before wheelspin occurs. It can be done at any speed. No limitations. Remember. Lockers were designed to prevent wheelspin. All the new electronic stuff is reactive. Wheelspin has to happen first and then the system tries to rescue what’s lost. Manual lockers are 100 times better.

• As long as the spinning tires are not much faster than the slower tires OR your rpm's are around 1000 with a manual and below 1500 with an automatic, you can still safely lock the diffs.
  

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