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sounds like you have blown the internal heater matrix and the thermostat is not working or is blocked. you are going to need a new matrix and thermostat and a bloody good flush out of the system just in case there is something in the system means taking off the rad hoses flush them out from both ends. and doing the same to the engine. replacing the matrix as its not going to be able to fix it if its shooting water out of the vents change the thermostat check pipes for damage.
Sounds like you could possibly have a pinion bearing issue. Have you had the pinion seal replaced recently? if so, sometimes the nut that holds the yoke on the rear differential gets over-tightned causing the pinion bearing to be too tight in the race, therefor damaging the bearing assembly and causes a "chattering" sound. When a pinion bearing goes bad in these Jeeps that is the noise they will make, even at lower speeds. Hope this helps..
Remove the rear cover and check for fine metal in the lube. Most internal differential problems are expensive to repair and require both experience and specific knowledge regarding using dial indicators etc. It is generally cheaper to replace the unit from drum to drum with a scrapyard unit where all that is necessary is to match the gear tooth (on ring and pinion gears) count to maintain the proper match to the front diff. This applies to all diff failures except outer axle bearings.
Sounds as If You Have A Chipped Tooth On the "RING GEAR" in the Differential (Rear Alex).
Is this Where You Hear The Noise Coming from? If So Remove Diff Cover With One Wheel OFF The Ground Trans In Neutral Rotate Drive Shaft and Look Closely For ANY Abnormal Surface on EACH Tooth of RING GEAR= the Large one And The "PINION GEAR" the Small one. If you find Chip or Rough spot Diff Must Be Rebuilt. Beyond that A Pinion Bearing can Also Make A Knocking Noise But the "GEARS" Will Be a Rhythmic Noise. I Hope this is of Some Help To You Good Luck !!
The only place you did not mention is the pinion seal (at the yoke where the driveshaft connects) Any leak from a differential should be fairly obvious...clean everything off well and drive it, You should see seepage somewhere. Any grease on the wheels or new fluid where you cleaned will tell you where to look. If it is at the pinion seal, If you haven't done this before, don't...you can disturb the adjustment inside the gear case and damage the gears.
Pretty much a bolt out-bolt in deal...Most critical part is actually making sure that you obtain a diff with the exact gear ratio as the one you are replacing. Count teeth on ring gear and pinion gear, divide ring gear # by pinion gear # and you will get a number (like 3.23, expressed as three twenty three to one) Diffs come with a tag on diff cover but many times tag gets lost if unit is serviced. Use flair nut wrenches on all hydraulic fittings, Plenty of wd40 on all hardware and support the body and diff while working so it does not fall on you while doing the job. Regardless t if it came with lube in it, change lube and make sure it's properly filled. Sometimes you will need to push and pull a bit to get bolt holes to align when installing. It's easier to do if you do not tighten anything fully till every bolt has been installed. good luck, any specific questions? just ask...