Use your noodle a little bit Chris, lets break this down:
Jeep Renegade Forum - View Single Post - Grinding/vibration/rumble Noise at ~30mph
So on this one in 2015 the Renegade Jeep Cares account said the fix was replacement of the RDM. The problem with this? Its from 2015!
I'll get back to that in a second but you also cherry-pick one post to support your case ( URL="http://www.jeeprenegadeforum.com/forum/416513-post159.html"]http://www.jeeprenegadeforum.com/forum/416513-post159.html[/URL] )
to which I say fine but in the same thread I can cherry pick posts from people for whom the replacement did not
work, I'm not going to now because I'm sure you read those and just chose to ignore them, but there are plenty of them there plus the example in our own forum where replacement did not work out for member KAMI_1 as you noted above.
The first part of the problem is there is no expectation that people will be good about going back to those threads and saying "whoops, just kidding, mine has the noise again all of a sudden". If they *think* its gone they will relax, turn up the radio and quit listening probably, or just give up altogether.
The much more substantial problem is the posts in that thread are very old, the latest STAR document we are aware of (S1503000001) is marked as a REVISION to an existing case, and states the dealers should remove all previous copies from their files. Now I don't think they actually give the case number in the Renegade thread so I can't say for certain its the same case but likely it is, or its the Compass version of the exact same case, and the LATEST document has backpedaled on the RDM replacement and now says "do not replace the RDM... Engineering is working on a software update to reduce it"
So, maybe back in 2015 when the Renegades were initially discovering the sound there may have been a bunch of (mostly unsuccessful) RDM replacements but they have obviously now figured out replacing that part doesn't help, because its a design characteristic.
Moving on, I don't believe you have sufficient evidence to assert that most Compasses are not affected. Going on 100,000 of these new models have been sold, you and I do not have anywhere near a sufficient sample to make claims about how many of the 4x4 ones produce this sound.
Moving further down your response... you are lost in the woods at "since it is clear they are still replacing parts due to this noise". No they are not. In 2015 they were replacing parts, sure, they are not replacing them now as far as we can see.
Your concern that the noise doesn't start in until 5k doesn't hold water with me. Its entirely possible that either A) you didn't hear it, or B) seasonal conditions reduced the scenario that creates the noise for you initially, or C) it took some miles for the transmission control module learning to tweak parameters into a range that creates the sound more often, or D) a combination of any or all of the above. At any rate, mine did it from within the first 100 miles, its still doing it today (and still running and driving great).
Other brands don't make this noise because most don't have a part-time system. They are mainly full-time AWD.
You are still misinformed about the AWD/4x4 nature of this vehicle. "4x4" is a marketing tool with a broad definition that includes pretty much any form of AWD system. Our cars are only "4x4" by the LOOSEST of those definitions, and they are NOT the same as a 4x4 system that is comprised of a longitudinal engine RWD platform with a transfer case and front differential that is separate from the transmission. These are front wheel drive transaxle
cars with a part-time rear axle, pretty much your quintessential all-wheel-drive. Again, there are no differential locks and the front wheels do the vast majority of the work almost all the time, you could drive one of these in "4x4 Lock" every day for the vehicle's whole life and nothing would be bothered other than your highway mileage would be a tad lower than it could be.
Lets see, then you have a bunch of comments on ESC, those are basically all based on your personal experience and opinion since you don't have any sources to back up how you seem to *think* the system works, so I can safely (dis)regard those comments with all the grains of salt they deserve... Sorry but I don't believe that monitoring estimated fuel economy is a valid indicator of when the vehicle is in 2x4 mode.
I don't get what you think it does different with ESC off, the ONLY thing that prevents this sound is by forcing the vehicle to stay in AWD. It may still be varying the amount of power being sent rearward until its close to nothing (there is a wet clutch back there) but something stays engaged full-time that would otherwise be free-wheeling and presumably making the sound you dread so much.
We can debate this topic for the life of the vehicles but every day that you and I drive ours to work successfully is another point for the "its not an issue" side. You say its going to fail eventually, well, literally everything on a vehicle is going to fail eventually
. The factory powertrain warranty is 5 years/60k miles. This would have been shown to you in no uncertain terms prior to you purchasing the vehicle, and it is on par with many other brand's warranties. They literally only promise 60k miles or 5 years worth, thats all. Thats not new news to anyone. You acknowledged this when you bought it. If you are under some impression that its supposed to last longer than that with no major service, you are pulling that idea out of thin air because we all know in black and white that Jeep only promises and expects the car to give you 5 years or 60k miles worth of relatively trouble-free service, and every mile after that is just a gift.
It sucks to put it that way, but they are a for-profit company just like all the others. They don't want to sell you a 10-year car, they need you to buy a new one in 2-3 years, 5 at most. Its not just Jeep. Things are not built like they used to be. We collectively shake our fists and demand more car for less money, this is what we get.
These buggies are here for a good time, not a long time.