Not standard on all 4x4, but an option on non-trd 4x4 only. From what I've read it has sensors at every wheel that will detect slipping conditions and it applies brake presure to that/those wheel(s). The locker would give false reading to the senosrs and that is why they don't put it on TRD equiped. Or something like that. From what I've read it is not very useful for offroading, but good for road handeling especially in adverse weather conditions.Eddie04 said:Thanks, couldnt imagine any factory traction junk being good.