Originally Posted by Purplefade

My money would be on the clutch as well, as for how to test that, hmmmm, I'm at a bit of a loss there as well... Maybe try a load in the hatch or trailer, something to add weight to the car\clutch and see if that exaggerates the problem?


I doubt it's the rear diff, mine let go over a period of about a year... yep a year... I couldn't find the hum, he couldn't find the hum, they couldn't find the hum, we couldn't find the hum, the best advice I got was "drive it until something officially breaks and then you'll know" - so I did and it was the diff - glorious mess too...


And I'm thinking probably not the CV because being all wheel drive that would almost be "invisible" as the other three would be pulling the weight, not to mention CVs usually just "pop" or "bang" pretty noticeably and very repeatably under "that" circumstance.


The "thunk" may actually be worn rear body bushings or worn rear control arm bushing, those bushings will often "thunk" under slow speed load changes, like pulling into a parking spot and immediately transitioning into reverse to adjust in the spot - when that arm is forced to "change direction" is when you'll hear \ feel it "thunk" - at least that's my thought anyway and the body bushings will unload at slow downs where you don't come to a complete stop and then accelerate away.