Remote Control monster trucks have a history here at The Lego Car Blog, which – if you’re an Elf at least – is not always a happy one (see here, here, and here). Fortunately today’s example was – despite its excellence – too slow for the Elf at the controls to run down any of its brethren, much to its annoyance.

Don’t let that put you off though, because this monster truck by previous bloggee Kevin Moo is a fantastically clever bit of kit, with all-wheel-drive, all-wheel-steering and all-wheel-suspension.

However that ‘all-wheel-ness’ is not the cleverest part, as Kevin has engineered an ingenious automatically locking centre differential design that keeps the wheels locked together when the truck is driving in a straight line for better grip off-road, yet unlocks when it’s cornering to allow the wheels to spin at the different rates required during a turn.

No, we have no idea how he’s done it either!

There’s lots more to see of Kevin’s Technic monster truck on Flickr and at the Eurobricks discussion forum, plus you watch the video below demonstrating the automatic differential lock to see if you can figure it out…

YouTube Video