The Commander rear disc brakes typically make squealing noise when they approach the end of their life. Napa sells a damper kit you can bolt on to remedy it. But usually, brake noise is cause by cheap brake pads. Look close at the rotors and pads, see if there is any damage or wear. If there is no damage but the pads look cheap (no shims between caliper and pad, that's likely the whole problem, do NOT buy $20 brake pads). If the rear pads are worn down near the very end of their life, well plenty of folks have cured the brake noise by just swapping in new pads a little early.
Personally, since I do my own brakes, I can swap in new quality brake pads and rotors (if needed) for a lot less than a garage or dealership can do it. So, I wouldn't let some brake noise scare me out of a purchase.
Now the driveshaft and grinding noises? That would scare me. I've seen several posts here about folks needing differentials replaced, that noise could be a bad driveshaft or a differential, possibly even wheel bearings or the transfer case.
The QDII, since it has clutches in the differentials, that require a friction modifier additive when changing the axle fluid and the axle fluid is suppose to be change often. There have been several posts about noise and binding up when making tight turns at low speeds with QDII, and they have reported changing in new axle fluid with the friction modifier fixed it.
The Rear Driveshaft on the Commander is NOT serviceable, it has to be replaced, the entire unit. And Chrysler seems to be going through a replacement parts shortage, so check if they are even available within the next 6 months. But it would be at least $680 just for the part to replace it. The
A new differential cost thousands.
The 2005-2010 Grand Cherokee has the same drivetrain, and many more of those sold than Commanders, many times over, so you could get junkyard parts if you can find them.
I'd insist the seller replace the axle fluid with the proper fluid (synthetic) and the friction modifier additive, and see if that cures the noise.
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Last edited by Mongo; 06-02-2016 at 09:12 AM.