The Defender is missing a locking front differential and instead relies on a brake-based electronic "differential" that automatically grabs the brake of a spinning wheel to force power to the wheel with traction.

How does diff lock work on Defender?

It works by taking power from the gearbox to both front and rear prop shafts via a two-speed transfer box bolted to the rear of the main gearbox. Its default setting is to send drive to the two rear wheels only.

Is a Defender permanent 4WD?

Modern Defenders feature a permanent four-wheel-drive system with a two-speed transfer gearbox and a lockable centre differential. The latter can be employed with the 4WD Low mode to ensure the Defender does its best in off-road conditions at reduced speeds and in low-grip conditions.