https://www.ontario.ca/document/official-ministry-transportation-mto-truck-handbook/inter-axle-differential-lock
The online version of the Ontario truck handbook. Use this book to study for your A and D licence, test your knowledge and prepare for your A and D road tests.
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https://www.drive.com.au/caradvice/when-do-you-need-to-use-a-differential-lock/
Dec 23, 2025 - It has become the must-have inclusion for every serious four-wheel drive, but when and why do you need to use your differential lock?
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