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Old 01-16-2015, 05:33 PM
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Clunk/thunk on 6-5 coasting downshift.

I'm scheduled to have my 2015 SRT looked at by a Chrysler field tech this coming week. Has anyone else here had a problem with a rough 6-5 downshift causing a clunk/thunk noise with a jerking sensation? This will be my third visit to the dealer for this issue. The first visit involved replacing the transmission valve body which did nothing to improve the problems the second visit was to make sure all software was up to date and to tell me that all Jeep SRT's have this clunk and that it's a normal condition for this vehicle. I'm just not buying it. Why would it only do this on a 6-5 downshift?

Please help my reaffirm to myself that I'm not crazy and that this is NOT a normal condition.

I'm hoping that this Chrysler field tech brings a fresh opinion to my dealer service department and does not suffer from the "they all do this" mentality.


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Old 01-16-2015, 07:00 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

FWIW mine does do this intermittently (~600 miles total, 400 of which were today driving up to San Jose on the highway), enough that I've noticed it but not enough that I am overly concerned. It's also not as severe as some have described. About 30% of the time it doesn't do it at all, and I don't tend to notice it as much under braking, or really at all when paddle shifting.
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Old 01-16-2015, 07:39 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

Mines got about 1400 miles and at least 95% of the time it clunks from 6-5 downshift. There is a definite difference while paddle shifting 6-5 vs. the rest of the gears as well. It's a very harsh shift.


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Old 01-16-2015, 09:52 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

I have a 2014, and have had all the TSB's done and while it is not severe - it is a noticeable 'loading up and then release' when downshifting from 6th to 5th - especially in Auto/Eco mode.

Look in the troubleshooting section one poor chap has had a hell of a time
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Old 01-17-2015, 12:14 AM
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Re: Clunk/thunk on 6-5 coasting downshift.

Yeah I think it's the same chap that started this thread.

Understand if this was worse on mine I'd be pretty peeved too.
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Old 01-17-2015, 01:09 AM
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Re: Clunk/thunk on 6-5 coasting downshift.

Known issue. Chrysler will just say it's normal and maybe do a relearn. It's annoying but I still love my beast!


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Old 01-17-2015, 04:54 AM
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Re: Clunk/thunk on 6-5 coasting downshift.

I have a 2014 with 20,000km on it and it does the same. Not so much on a long slow deceleration, but some of the quicker, shorter stops, which makes it even scarier. I've had the tsb relearn as well.
From what I've read on this forum the only thing that works is disconnecting the battery for a minimum 8 hrs and then the transmission does a relearn of the driving habits. Take it easy for the next 800 miles. Don't quote me on this one folks. Haven't tried it myself.
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Old 01-17-2015, 07:18 AM
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Re: Clunk/thunk on 6-5 coasting downshift.

Mine is more a problem at the slower leisurely stops. If I stop suddenly it still clunks, but not as bad. Possibly because it just goes past 5th quicker. Also my trans temp yesterday on the highway at 77mph was right at 201 degrees F. Seemed kind of high considering it was only 23 degree F. outside.


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Old 01-17-2015, 01:42 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

Mine does the same thing. 6-5 downshift is harsh about 80% of the time. I have a 2015 with 3500 miles. I haven't had it looked at.


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Old 01-17-2015, 02:37 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

I choose the 2015 on my dealers lot over the two 14's they had because I figured they'd have these issues worked out. I was wrong. I really don't want to have to "just live with it". Sigh.


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Old 01-17-2015, 04:49 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

Did a battery 'reset' overnight last night - didn't help my suspension issue - but the trans seems better on 6th to 5th --- but my old problem of 5th to 4th is back... FML. Maybe I will just start driving with paddles all the time...

I'm beginning to think this is just something we have to live with boys... re-program, re-learn and hope it isn't too bad... (but if it jars your brain, it should be fixed right... good luck to those who have it that bad!)

for the rest of us...Drive it like you stole it and the Hellcat Jeep will be out by 2017/18 and we can all upgrade and hope the trans lasts until then...
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Old 01-17-2015, 06:39 PM
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Re: Clunk/thunk on 6-5 coasting downshift.

mine does this too, but I hardly notice it, and not concerned about it….doesn't do it very often though..….have a 2015 with 1200miles on it….Love my beast!!!
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