Powertrax's No-Slip provides 100% lock-up under maximum traction output. Provides smooth and quiet operation. Eliminates the noise, harshness and ratcheting-around-turns associated with conventional lockers. No special tools needed for installation or altering ring and pinion set-up. Fits both open and limited-slip differentials. Available for most RWD cars and 2WD/4WD Trucks, SUV's and RV's.