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Shifting thunk could use some straight answers.

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Old 05-09-2022, 09:55 PM
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Default Shifting thunk could use some straight answers.

2007
Grand Cherokee Laredo
Automatic
3.7 L 6 cylinder gasoline engine

We bought this jeep used, and during the test drive we noticed a "thunk" when we shifted into reverse, and in park. It doesn't thunk when shifting as we're accelerating up to speed. When asked about it the previous owners said that it was a transmission mount. I asked the local parts store, and they suspected an engine mount. I don't know what the issue is and just trying to make the jeep last as long as I can, as we're on a budget.
Old 05-12-2022, 07:21 AM
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Get on the ground to observe the driveline while making it clunk. That should narrow your search area down.
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Old 05-19-2022, 07:42 PM
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Jack up a rear wheel (if limited slip both rear wheels)
slide under it and have someone rotate that wheel back and forth observe the drive line,
Look for any slop, be it U-Joints or the Rezzeva CV types, lay your hand on the shaft, if can't see, should be able to feel it.
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