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Old 07-16-2018, 02:25 PM   #1
green97
 
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68fre noise

So I bought a 2008 3500 with the 68fre. It was deleted and had unknown efi live tunes on it. I used the autocal that came with the truck to load the stock tune back in. I installed an H&S Mini Maxx with the Overdrive tune. It ran and shifted good for about a week or two, then I started getting a noise on the 6-5 and the 4-3 downshift. It didn't do it all the time, mostly with tow haul and the exhaust brake on. Found a scan tool and did a quick learn on it, drove it for another few days before it did it again. Returned the truck to stock and loaded the tune on the autocal back in and did another relearn on the trans. Drove for a week and a half before hearing the noise on a 6-5 downshift. Anyone ever run into this? Its hard to describe the noise, not really a grinding or a high pitched squeak, sort of a dull noise that only lasts about a second if that. Truck still shifts fine and the fluid is clean, the dealer said it had roughly 6k miles on the transmission rebuild.
 
Old 07-16-2018, 03:05 PM   #2
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That's pretty much what it sounds like haha only does it occasionally which is the aggravating part
 
Old 07-16-2018, 05:10 PM   #3
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Anyone got a recording or is it too random?

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Old 07-16-2018, 06:13 PM   #4
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It's too random on mine. You can drive it for 2 weeks and not hear it or hear it several times in the same day. It seems to be a little worse pulling a trailer with tow haul on but it still does it just driving
 
Old 07-16-2018, 06:20 PM   #5
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I've only heard it on one or two upshifts from 5-6. The rest is when it downshifts
 
Old 07-16-2018, 06:25 PM   #6
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So, could it be called "The Chihuahua Yip" (TCY)?
Or, "The Shepherd Yelp" (TSY)?
I'm going to have fun with this, I just know it.

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Last edited by Mark Nixon; 07-16-2018 at 06:27 PM.
 
Old 07-16-2018, 06:38 PM   #7
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Probably the shepherd yip, not quite high enough for the Chihuahua
 
Old 07-16-2018, 07:42 PM   #8
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I did a good bit of reading but wasn't sure it was exactly what mine was doing. Good to hear there are at least others that do it too
 
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