Car feels like it jerks and makes a clunk noise at low rpms - Mustang Evolution

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Old 03-12-2013, 12:29 AM   #1
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Car feels like it jerks and makes a clunk noise at low rpms

I have a 2012 v6 auto and when I slow down I can feel this light jerk and it sounds like something popped out or clunked. It doesn't happen a lot but I don't want it to get worse.

Is this because of the mod on my car,3.73 gears and tune? Appreciate any advice.
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Old 03-12-2013, 06:34 AM   #2
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To rule out the tune, put the stock tune back in and go for a drive. If the jerking clears up, contact the company that created the tune for you and get a hold of their customer service group.

It could be the rear gear install; who did the installation? Drive shaft reinstall tight? Maybe the driveshaft is loose from the re-installation. Take it back to who ever did the gear install and have them re-check everything.

My car will clunk every once in awhile during rush hour crawling stop and go. I have no tune installed at this time.
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Old 03-12-2013, 07:03 AM   #3
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I have a 2004 mustang GT auto and it does the same thing every once in awhile. When the RPMs drop from around 3/2 down to 1 it will jerk a little. No gears installed or tune yet.
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Old 03-12-2013, 07:34 AM   #4
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My 2011 automatic has always gave a little nudge at a few miles per hour when coming to a stop. I thinks it normal, but mine doesn't have any sounds.
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Old 03-12-2013, 01:10 PM   #5
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Thanks for the advice. I will call the guy who installed the gears. He did a good job but I was concerned about the jerking/nudging.

I was reading that the noise might go away if I buy a new drive shaft. Maybe this will be my excuse to get get one. I didnt think I would need one since Im not a speed demon but they say the ride is smoother.
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