94 jeep grand cherokee laredo V8 5.2l automatic. Drives fine but after 10-15 mins of driving After its parked it makes loud popping noise from the rear. Cant locate where the sound is exactly coming from. also sounds funny (grinding?) when turning at low speeds 1-20 mph. Maybe the differential? If so how do I change/check fluid level?

You can check fluid level by removing the rubber plug in the cover. Fluid is full when on level ground, it is just at the edge of the hole (or very close) if you are already getting noises out of there, you can remove the cover and inspect gears for wear or breakage. If you find a large amount of metal debris in the lube it tells you something bad is going on back there. Although rebuildable, it's not a home job...requires exact settings in order to operate properly. You can find good units far cheaper than even a gearset costs in any scrapyard. to match ratio, count the teeth on the ring gear and the pinion gear. the replacement MUST have the exact same number. Before swapping diffs, check all back there to make sure noise is not from somewhere else.