my money is on a posi-lock (not to be confused with a locker)
if you follow the cable coming off the back of that knob, I bet it runs to a box (for lack of a better term) on the passenger side of your front axle. pulling the cable slides the shift fork connecting the inner and outer shafts on the passenger side.
original equipment was a vacuum motor, which is a common failure point, so many replace the vacuum shift with a cable mechanism
Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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