torsen diferansiyel

The key to this thing staying same speed across both axles and having some axle speed difference is in the angles of the screw gears. 45 degrees holds them at the point of being one way or the other.

the gears only spin one way easily. giving traction

why need it

A standard differential will tranfer all the power to a wheel slipping in mud, snow, etc. This design won't. To make a standard diff transfer power to the wheel with good traction is possible by putting clutch discs on them. They're called limited slip differentials & they're prone to failure and require more maintenance. This type is bullet proof. Formula one race cars use a different version of this type. That should be endorsement enough. The guy who invented this was a genius.

oh hell ya, the guy who invented the first diff was genius enough already

why? u need it between the frond and the rear axle,if u have a 4WD car

would really help with parallel parking.

0:33 WOW! It is an waiting video!

Wasn't this once called a "squirm" differential? I heard they're used in the mules they use at airports to push the planes around, and pull the luggage trains.