This just recently happen to me with new shaft. The outer boot was loose and oozing grease. For temporary fix, I put on a standard screw tighten clamp. It's holding up so far and hasn't hit anything while rotating and making turns.
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97 V6 4X4 AT; ICON 2.5 EXT TRAVEL COILOVERS / SS 1.2 REAR; AUSSIE LOCKER; TC UCAs; SAVAGE OFFROAD SLIDERS AND SKID PLATES; ARB BUMPER; WARN WINCH; LOTUS CONTROL ARM SKIDS; DECKPLATE/ISR; 265/75/16 BFG KM2