1998 Jeep Grand Cherokee

Drive Train Axles Bearings problem
1998 Jeep Grand Cherokee V8 Four Wheel Drive Automatic 155555 miles

i put my jeep in 4 low and attempted to powerbrake and something snapped/ broke. Now something rattles when driven over bumps in road it seems to come from the front. Drivers side cv boot is twisted and seems to have no grease. How do I find out what I broke where do I begin?
October 31, 2010.

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