Loud Intermittent Buzzing Noise Jeep Cherokee Sport 2.8 CRD 2005

Most auto parts stores with decode for you , for free.

this might get you going remove the starter relay and jump 87 and 30 together make sure its in neutral. https://youtu.be/FAdfUFzw-L4

Some vehicles with automatic transmissions have enough slop to create this noise normally. If the problem just started or has become increasingly worse, it could be due to worn universal joints. The universal joints couple the drive shaft to the drive axle and the transmission on 2-WD and to the transfer case on 4-WD. Another noise that comes from worn universal joints is a squeeking sound at lower speeds. A vibration could also be noticed with worn universal joints.

Yes...both are identical. Only thing I'd check further on is if one has a manual transmission you may have a different flywheel flange or will need a pilot bushing if the vehicle getting the engine is stick.
If both are automatics...no problem at all.

Your automatic transmission has an internal low and indirect clutch. The indirect clutch is what's used when your vehicle is in reverse. You might have a heavy jerking when you put it into gear that feels like vehicle got hit by another or loud rattling or chattering in gears. It very well may be coming apart as you think and soon, so I'd recommend taking it to your local transmission shop to inspect and test it and they can give you a more detailed idea of what it would take to fix it. good luck

Check for correct power steering fluid level

Give a try by change your transmission/filters and Transfer case oil.

disconnect the battery or pull the ignition fuse,then replace the ignition

Was the vehicle a previously rental vehicle? because if it was there is probably a speed govenor on it or a rpm govenor on it most likely a speed govenor if a previous rental vehicle

I would start by checking all the fuses under the hood.
There is a fuse called IOD which the factory leaves out and gets put in at the dealer.
That fuse could be bad.