* 4x4 systems: These include various configurations like 4x2, 4x4 with part-time or full-time engagement.
* Electronic Locking Rear Differential: This is an option on some F-150 models and helps improve traction in low-traction situations.
* Traction Control System (TCS): This is a standard feature that helps prevent wheel spin.
* AdvanceTrac with RSC (Roll Stability Control): This is Ford's stability control system which helps maintain control during challenging conditions.
While these systems improve traction and handling, "Positive Trac" isn't a Ford terminology. It's possible you're thinking of a similar system used by a different manufacturer.