It's permanant four wheel drive,the short stumpy lever engages High, Low and difflock in your transfer box, forward for high backwards for low, left for difflock on, right for difflock off, unless you're on gravel, mud or wotever will allow the wheels to spin don't drive very far at all with difflock engaged, you should get a light on the dash a bit like a sideways H when difflock is engaged, It wont come on immediately or go off immediately cos of the mechanism in the transferbox. Engage/disengage either while stationary.