Posi-traction is GM's name for a limited slip differential and is very common. The wheel with the most traction will turn. A locking differential acts like differential lock on a tractor where power to goes to both wheels equally. Not the same as posi-trac. Many people have confused posi-trac for a locking differential and claimed it was better than Fords limited slip. They are exactly the same thing. I don't know if new trucks come with a locking diff. option? They have traction control but that mostly limits engine RPM's so you don't spin the tires so fast. Steering is affected with a locking differential but a lot of guys with hot rods weld up the diff. gears to make it a full time locking diff. You get tire scuffing on tighter turns. There are some really fancy traction control systems on high end vehicles too.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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