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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8611
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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Im getting a backlash thump in the back of 2003 outlander

Customer Question

im getting a backlash thump in the back of 2003 outlander
Submitted: 2 years ago.
Category: Mitsubishi
Expert:  Doug replied 2 years ago.

The most common causes for this are the bushings in the rear differential being worn out (if AWD) and the pillow bushings in the rear trailing arms being worn or separated from the arms (both 2WD and AWD affected).

The best thing to do here is get the vehicle somewhere you can elevate it into the air while a helper shifts back and forth between forward and reverse gears and you can see if there is movement in the rear differential. If there is, then replace the bushings. At the same time you can of course inspect the drive shaft for abnormal movement etc.
If there is no issue found with the differential moving, then you would want to consider the rear control arm/trailing arm bushings. This is more easily felt on the ground (since it relies on road resistance to make that thumb sensation. With a trusted helper at the wheel, you would want to lay down beside the vehicle and place your hand on each suspension component as the helper reproduces the sensation. That way you can feel the component at fault and address it directly (be new bush or new arm, depending on which is failing sometimes they come assembled).