[Excaliber]

I assume King Cobra is asking about a "posi" or "detroit locker" vs an "open diff". The word "locker" in my mind suggests a "spool".

The GOOD thing about an "open" rear is the car is FAR LESS likely to swap ends on you when you DON'T want it to. The Bad news is, the car is far less likely to swap ends on you when you DO WANT it to.

I like playing with throttle over steer, which a "posi" type unit allows for. It's pretty hard to get the back end "dancing" from side to to side with an open rear. And with 400+ horse it will be "difficult" to get it to hook up by just playing with tire pressures.

The only "problem" I have with posi type units is:

They WILL bite you in the ass by snapping out the rear end under even MODERATE accelleration when you LEAST expect it. The car is MUCH more likely to get out of control with one.

As my posi unit is now essentially "blown" it's like I have an "open diff". Running SCCA events or open track road course this is a MAJOR problem. And hooking up in straight line is not easy! You WILL get one tire wheel spin.

Now on the street, I LOVE the open diff. Much more enjoyable to just "drive" and not worry constantly about "throttle position" and the potential for a "spin out" right in the middle of an intersection.

.........maybe I'll quit racing and buy some car wax..........

Ernie