I recently replaced the serpentine belt, which was whining and wearing a bit faster than I expected. Afterwards, the whining stopped but there is now a rattling sound coming from the engine area. It is present while idle and in park, and increases when I accelerate. It usually goes away after I decelerate, then shift into nuetral. Has anyone else experienced a similar issue? Any suggestions for troubleshooting?
SOURCE: 2000 Jeep Cherokee Gear Grinding & 4WD Whine sound
Give a try by change your transmission/filters and Transfer case oil.
SOURCE: jeep 360 rattle sound at idle in park
it could be a wrist pin, and im not sure if those amc's had hydraulic lifters but sometimes with old lifters when the oil pressure is lower at an idle the lifters arnt filling up all the way so they develope a little valve lash, and when the rpms are raised the oil pressure raises and fills the lifters. you could try chasing the noise down with an automotive stethoscope.
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