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Car feels like I ran over something on quick acceleration

My vehicle (suv) feels like I drove over something on a fast acceleration from a stop. This only happens when stopped and a quick acceleration. If I accelerate slowly it doesnt happen. Everything else seems fine. No check engine light on and 300,000 kms on vehicle.

If you are feeling a strong thump in the SUV as it accelerates hard you should check out the condition of the motor mounts. A worn motor mount will let the whole engine and transmission move around too much and make that sort of sound and feel.

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So which SUV IS it? Are you going to make us guess? If you want a cause and possible solution, post as much information about your SUV and the problem.

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My guess a bad U-joint if so equipped.

The torque converter lock-up function might be involved, if an automatic trans.