Been offroading for the past 15yrs. Owning all Chevy trucks. This is my first Toyota and I love it! The chevys I have had in the past have always had LSDs which I liked. I tried the locker when I first got my Taco last month and had problems with it engaging. Yes, I read the manual. Put it in 4low and pushed the button. Finally, I brought it in to the dealership. The mechanic said he was able to lock it. The service mgr tried to lock it and it wouldnt lock. He said I had to drive it a bit in 4low for it to lock. BS I say, thats not what the manual says! He got it to lock after driving it about 100 meters (going back and forward). I have learned to move it back and forth from drive to Nuetral and then 4hi then 4low for it to lock. Any help would be great. I am thinking about taking it to another dealership for help.