Toyota 4runner 2010 Instruction Manual page 235

CAUTION
To avoid an accident
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Do not use the rear differential lock system except when wheel spinning
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occurs in a ditch or on a slippery or rugged surface. Large steering effort
and careful cornering control will be required.
Do not lock the rear differential until the wheels have stopped spinning.
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Otherwise, the vehicle may move in an unexpected direction when the dif-
ferential lock is engaged, resulting in an accident. This may also lead to
possible damage to rear differential lock component parts.
Do not drive over 5 mph (8 km/h) when the rear differential is locked.
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Do not keep driving with the rear differential lock switch on.
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2-4. Using other driving systems
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