Transmission Shutter After Fluid Change - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 8 (permalink) Old 08-28-2016, 11:04 PM Thread Starter
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Transmission Shutter After Fluid Change

Hey Everyone i have the 06 300 SRT. It has 34,000 miles on it. I just had the dealer change the transmission fluid and filter for me because I felt like it was time. Now, when i start it up, if I dont let it sit and idle for more than about 2 minutes or so, if I drive off and come to a stop I get a bad vibration. If I drive off and dont come to a stop within a few minutes then I dont get a vibration but I do still notice that the transmission is shifting gears a little harder than before and not as smooth. Almost as if they replaced the factory fill with some garbage fluid.

So then I noticed that fluid was leaking out of the bottom so I took it back to the dealer and they found to have overfilled it. They just did the fluid and filter change not a flush and they added 6 quarts which ended up being over a quart and a half too much according to the chrysler tech. Now that the fluid level was said to be correct I thought the problem was gone but I hadnt shut the car off and then restarted it before leaving so I was wrong. The problem is still there and it even happens if say I stop to get gas somewhere and then when I restart the car the fluid is still hot but it does this vibration when coming to a stop for the first couple of minutes.

What can be the problem here? I was reluctant to even have them change the fluid but I figured the car is 10 years old and even with light mileage it was probably a good idea but now I feel like I made a mistake by having a routine maintenance done.

Also, what if some damage was done by the overfill? Would that allow me to be covered in case I need a new transmission? Especially that im long out of warranty.

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post #2 of 8 (permalink) Old 08-29-2016, 02:00 PM
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the fluid level has to be exact and it MUST be ATF4+.....NOT Dexron III.
The level has to be measured at a precise temperature. If its not the exact height on the dipstick they use compared to a given temperature graph you'll get real issues - shifting / change severity / gear slip it goes on and on. Just chucking in the amount stated will not do at all....this gearbox demands accuracy within 100CC or so at a precise temperature (the fluid expands enormously as it gets hot), so being a half a pint over or under can make a ton of difference. A quart over, as you suggest, is asking for bad damage to occur. Get the fluid level sorted out properly, hopefully you havent killed the trans, and never go to see those idiots again
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remind me not to have that video guy change my gearbox oil

this guy is annoying, but gets it pretty much right


Jeep Grand Cherokee W5A580 NAG1 722.6 Automatic Transmission Fluid Change Check Fill - YouTube
details of the dipstick and the temperature chart are here....Tranny Dipstick...hope this helps anyone with similar issues

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post #3 of 8 (permalink) Old 08-30-2016, 03:29 PM Thread Starter
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they seem to have used the correct oil. mopar part # 68218057ab. they put 6 quarts in when they did the filter change but it was coming out the vent hole so they took over a quart out. not sure exactly how much.

had them check it a third time for the correct level and its still doing the same thing but its not leaking anymore. converter lock and unlock is a little harsher than before and the shutter after startup for the first 2 min or so is still there.
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post #4 of 8 (permalink) Old 08-31-2016, 06:04 AM
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Not every dealer is familiar with the correct fill procedure of the Nag1... Kaiser Bill is bang on, this sounds like an improperly filled unit to me.

There is a chart and special dipstick... It MUST be used to prevent issues and or damage. I'd go somewhere else and have them check it personally.

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post #5 of 8 (permalink) Old 08-31-2016, 06:06 AM
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Quote:
Originally Posted by Siciliano15 View Post
they seem to have used the correct oil. mopar part # 68218057ab. they put 6 quarts in when they did the filter change but it was coming out the vent hole so they took over a quart out. not sure exactly how much.

had them check it a third time for the correct level and its still doing the same thing but its not leaking anymore. converter lock and unlock is a little harsher than before and the shutter after startup for the first 2 min or so is still there.


I attached the chart for you just in case.

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post #6 of 8 (permalink) Old 08-31-2016, 02:41 PM
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I drain and refill my trans fluid every 15K miles (swapped on a Mercedes trans pan with a drain plug), and drop the pan/change the filter every 30K miles. I only drain/fill, never flush. I'm at 120K miles now, so I've done this more than a few times. I bought a B&M dipstick that locks in place so I can check the fluid anytime. Haven't had any transmission problems at all.
I concur with the opinions above...the fluid level is still not right.
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post #7 of 8 (permalink) Old 09-01-2016, 09:08 PM Thread Starter
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ill try this chart and see what happens. thank you
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post #8 of 8 (permalink) Old 09-15-2016, 10:54 PM Thread Starter
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So the problem ended up being my exhaust. I had it dropped and welded up a few days before the transmission fluid change and hadnt noticed anything but i looked under the whole car today and found that the muffler was touching the rubber coupler that connects the driveshaft to the rear diff. I guess when they dropped the catback the pipe must have shifted just enough. I ended up putting a small dent in the corner of the muffler and it fixed the problem. Soooo glad it was nothing serious. No more vibrations now. It did lightly wear on the rubber but only a small amount it will be ok.
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