1998 Jeep Grand Cherokee 4wd 6cy Auto. Have a noise that we first thought was a cracked fly wheel. Replaced this. Noise back. Removed plugs one at a time at #4 the noise was gone. Dropped oil pan and found rod bearings worn. Replaced them. Noise is back. With a stethoscope the noise is around the rear of the oil pan. Moving forward or past the rear of the oil pan the noise gets fainter. This was done from below. At idle speed the noise sounds like valve noise. At @2000rpm the noise seems to disappear but at and above 2500rpm it's back. The engine hasn't lost any power and we have good oil pressure. The engine hasn't been overheated. Transmission shifts ok.
Check for a loose heat sheild on exhaust system usually on top of catalytic converter....happened to me
SOURCE: THumping noise in Rear End of Jeep Grand Cherokee 1996
sounds like bent axle? any accidents or heavy off roading
SOURCE: Rear Suspension noise on 2001 Jeep Grand Cherokee V8
Check sway bar. On some models as suspension sags, sway bar outer ends will contact the body, leaving a mark or dent just above the end, causing a bang over bumps. Only way to correct this is to change springs or add a spring lift.
SOURCE: How to shift a 1998 jeep grand cherokee into 4 wheel drive
Four low is almost never used. I use it on very steep rocky or muddy trails in the woods or to pull someone out of mud or a ditch. Though some will shift standing still it is best do do this while rolling. Four high can be shifted at low speeds of 2 to about 35mph (higher also but not really good idea) Low can only be shifted between 2 to 10mph. If you find yourself stuck and unable to shift because you aren't rolling you can also turn the engine off, engage the transfer case and re-start. That avoids having the gears clashing together. Best rule is if it begins to grind, don't force it.
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