Why does my car clunk in rear when backing up jeep liberty?

SOURCE: how to replace rear brake pads on 2005 jeep liberty

put the back of car on jack stands and secure the front tires so it does not roll and then remove the bolts off the back of the caliper there is normally two one at top and one at bottom and spray it with some kind of oil for rust and make sure you have the right size socket before you try to loosen them and once caliper is off and the old pads removed take one of the old pads and squeeze the piston on the caliper back in by using a "C" clamp and also remove some of the brake fluid from the master cylinder before you do this put the new ones back on and check the brake fluid and make sure it is full and then pump the brakes to make sure you have a good pedal also put some "No Squeak" brake stop on the back of the pads so they don't squeak they will have that where you buy the pads from

SOURCE: How to replace reak brake rotors on Jeep Liberty

Replace rear rotors on 04 liberty.
Remove tire & wheel
Remove brake caliper, tie up out of way.
Back off e-brake shoe adjustment.
Remove factory spring clip from lugs (2places)
This is the crude part....
After attempting to pull off disc/drum with puller....I got pretty sick of it. Understand this is in the Northeast with lots of salt on the roads in winter. Needless to say there is a ridge of rust around the inside edge of the e-brake surface. Any more pressure and I was afraid of damage to the e-brake shoe asembly. I then took a small grinder with a cut off wheel and cut the disc thru (used space where caliper usually sits). Also cut nearly through the face between 2 lugs. You can't quite get thru the back corner at the disc. Since the material is cast iron it will crack when you drive a wedge in the slot cut in the disc. This opens the housing around the shoes and it slides off easily. The cutting operation took less than10 mins, alot less than the puller with hammer assist!
I know this is a bit "unorthodox" to say the least, however the object is to remove the old junk disc safely and as quickly as possible, without harming the e-brake parts inside.
Install new parts in reverse order, new pads go in easy after squeezing the caliper piston back with a c clamp as is the normal procedure.

SOURCE: clunking in rear end Jeep Liberty 3.7 automatic

Nearly impossible to tell you what it is without actually hearing and seeing it. I recommend that you check the rear universal joint, pinion bearing and wheel bearing assemblies for looseness. If it's that loud it shouldn't be too hard to find.
Good luck!!! If you need help doing the repair or have other questions just ask!!!

SOURCE: rear suspension,bushings,2005 jeep liberty

Generally the bushings aren't too expensive (likely about 25-30 each...But, unless you have done this kind of work, driving the bushings out and installing them can be difficult without a press. I've done many in-shop and its nothing like the ones I've done at remote locations using a hammer and chisels etc. You can do this yourself but I'd opt to do the r&r at home and have a machine shop do the actual bushing pressing. If you damage the arm ends you will need to replace the arm or do a bunch of bending to get the bushings back in place.
If you do have a press, than go at it!!

SOURCE: Loud Clunking when jeep starts moving in drive.

may be the gears in the rear end or check your motor mounts, ive had the noise and it was motor mounts