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Originally posted by bigmacdaddy:
What's a detroit locker?
From the website:
Detroit Locker
The Detroit Locker maximizes traction by delivering 100 percent of the torque to both drive wheels. It is engineered to keep both wheels in a constant drive mode, and has the ability to automatically allow wheel speed differentiation when required. Enthusiasts and professionals use the Detroit Locker in many off-road applications. It is the only differential used in NASCAR

Often referred to as NO SLIP on the RPO code sticker when put in an Eaton Rear End.