68fre noise

G

green97

New member
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.
 
green97 said:
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.
Click to expand...

Ahhh the infamous trans "sqwuak", kind sounds like you run over a dog!
 
green97 said:
That's pretty much what it sounds like haha only does it occasionally which is the aggravating part
Click to expand...

So here's the thing.....

There's not a single builder out that knows 100% the cause....

Even the guy that goes by the user name of transengineer that was apart of the chrysler 68rfe design team says in oem and aftermarket applications, the noise has been recorded and noth ing identifiable is the cause. Yet Chrysler attempted to address it back in 2013 or so by changing to Valvoline atf-4. Some say it's in the tuning, some say it's gear hazing, I personally think it's a cluster!
 
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
 
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. :D

Mark.
 
Last edited:
It's most common on the 3-4 upshift, and down shifts.

I personally think it has to do with line pressure loss. The 68rfe pump and valvebody have many many many potential weaknesses.

I have the sqwuak on mine right now, but typically does it in low rpms only. Less pump pressure, less volume keeping up with the high line psi desired on these tunes.

I also think I have a valve body cross leak in mine as I get occasional slow to shift in certain gears which is the TCM not seeing the line psi it wants causing a hang up.
 
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
 
You must log in or register to reply here.
Back
Top