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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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