1st to 2nd shift bog

Murray, I'm assuming you had the DCT filter changed and transmission fluid top up at 12,000 km. Not the extra 2 liters for the Z51.
Have you tried doing this in Sport or better yet Track mode in "M" and see if it still happens? If it does, the first thing the shop will
check is your fluid level and then to see if there's metal particles in your DCT filter.
Is your car still under warranty for time not distance? If it is transmission the power train warranty is 160K I believe if not.
 
Mr.Corvette said:
Murray, I'm assuming you had the DCT filter changed and transmission fluid top up at 12,000 km.
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Yup, I was raped ... er... I mean I had it done. Not looking forward to the bill for the fluid change!
 
MKinOntario said:
FWIW, the newer C8 Owner Manuals (2023, as I was hoping to get one, and downloaded it) have some added transmission maintenance intervals and parts mentioned on or around page 306-307, including changing the "external canister filter" at 7,500 miles, then again at 22,500 miles with fluid if required, and then again every 22,500 miles thereafter. "Failure to do so may invalidate warranty coverage on the transmission".
I could find no such similar maintenence intervals or equipment recommendations or caveats in the 2020 OM. Just the 72,000 mile fluid change interval.
Much has changed in the 3 years since the first C8 dual clutch transmission, methinks?
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The C8 manual has always had those filter change intervals. Look in the chart and the footnotes under it. (EDIT: I'm looking at the US manual. Now that I think about it, I looked at the Canadian OM once, unintentionally, and didn't see the chart in it. Here's what's in the US manual prior to 2023. (The red outlines are from when I posted these on another forum). I wonder why this charte was omitted from the Canadian version.

maintenance chart 2.png

service schedule footnotes.png


On the "every 22,500 thereafter," GM has clarified that wording as it could be interpreted in two different ways. Some thought it meant change it a 7500 and then 22,500 miles after that, e.g., at 30,000 miles. GM has clarified is should be changed at 7500, then at 22,500, then at 45,000, etc.

Fluid changes are required at 45,000 miles or 3 years, whichever comes first. So at 3 years, even if there are only 7,500 miles on the clock, it's due a fluid change.

There is no time based requirement for canister filter changes. The OM says to change it during the fluid change only if it's close to the mileage interval for the filter change.
 
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wlgj said:
I have not used manual , yet . Is it like other cars, that have that, use paddle shifters , only when in manual? I do not want to screw up my trans. On my Mustangs it did not seem to matter.
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Almost impossible to screw it up by using manual, once you're past the 500 mile break-in. If you forget to upshift, you'll just hit the rev limited. If you forget to downshift, the DCT will downshift by itself to prevent you from lugging the engine, and as you come to a stop. And if you attempt to downshift into too low a gear (that would overrev the engine), the car won't let you.

You can use the paddle shifters in manual AND in automatic (D) mode. If you're in D, and use the paddles to downshift, the car will do as you ask and then return to auto mode in about 30 seconds.
 
Murray20c8 said:
If the Mustang has a DCT then yes, it's likely the same. If not then it's quite different.
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meyerweb said:
Almost impossible to screw it up by using manual, once you're past the 500 mile break-in. If you forget to upshift, you'll just hit the rev limited. If you forget to downshift, the DCT will downshift by itself to prevent you from lugging the engine, and as you come to a stop. And if you attempt to downshift into too low a gear (that would overrev the engine), the car won't let you.

You can use the paddle shifters in manual AND in automatic (D) mode. If you're in D, and use the paddles to downshift, the car will do as you ask and then return to auto mode in about 30 seconds.
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That is, what I wanted to know. I can use the paddle shift, in Auto mode. One of my cars , which one I cannot remember, I could only us paddles in manual mode. Thank you.
 
wlgj said:
That is, what I wanted to know. I can use the paddle shift, in Auto mode. One of my cars , which one I cannot remember, I could only us paddles in manual mode. Thank you.
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Some Mustangs have a DCT's I believe, but some also have slush boxes. They react differently.
As meyerweb said, you can use the paddles in auto. I do that a lot. If I use manual and forget I'm in manual I hit the rev limiter a lot. In Auto after about 10 seconds if nothing changes, it returns to auto mode and is identified by a large D. If you use the paddles in auto the D gets small.
 
Murray20c8 said:
Some Mustangs have a DCT's I believe, but some also have slush boxes. They react differently.
As meyerweb said, you can use the paddles in auto. I do that a lot. If I use manual and forget I'm in manual I hit the rev limiter a lot. In Auto after about 10 seconds if nothing changes, it returns to auto mode and is identified by a large D. If you use the paddles in auto the D gets small.
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Only GT500 is DCT, 10sp is a normal torque converter setup
 
So just returned from a trip to the dentist. Tried full throttle launches several times. Only once did it balk and not at all as bad as yesterday. So, perhaps Denis is right and it was the nannies on dusty roads.
BTW, Has anyone had their DCT fluid changed? I'd like to hear how much was charged,
 
Murray20c8 said:
Some Mustangs have a DCT's I believe, but some also have slush boxes. They react differently.
As meyerweb said, you can use the paddles in auto. I do that a lot. If I use manual and forget I'm in manual I hit the rev limiter a lot. In Auto after about 10 seconds if nothing changes, it returns to auto mode and is identified by a large D. If you use the paddles in auto the D gets small.
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Cool I will try again tomorrow 🙂
 
meyerweb said:
The C8 manual has always had those filter change intervals. Look in the chart and the footnotes under it. (EDIT: I'm looking at the US manual. Now that I think about it, I looked at the Canadian OM once, unintentionally, and didn't see the chart in it. Here's what's in the US manual prior to 2023. (The red outlines are from when I posted these on another forum). I wonder why this charte was omitted from the Canadian version.

View attachment 110571
View attachment 110572

On the "every 22,500 thereafter," GM has clarified that wording as it could be interpreted in two different ways. Some thought it meant change it a 7500 and then 22,500 miles after that, e.g., at 30,000 miles. GM has clarified is should be changed at 7500, then at 22,500, then at 45,000, etc.

Fluid changes are required at 45,000 miles or 3 years, whichever comes first. So at 3 years, even if there are only 7,500 miles on the clock, it's due a fluid change.

There is no time based requirement for canister filter changes. The OM says to change it during the fluid change only if it's close to the mileage interval for the filter change.
Click to expand...
Some of the info from your US Manual chart is spelled out textually, in the 2023 (Canadian) manual on pages 306-307. Not so in the 2020 (Canadian) C8 manual, that I could find.
There was a reference to the 72,000 km interval that Murray referenced on page 221. That's it, for the 2020 OM on Transmission Fluid Life.
Why would you refer to the US manuals, when we're clearly in Canada? Yes, those charts aren't in the Canadian manuals, that I could find. I believe we call that an apples/oranges conundrum?
Yes, they're mostly the same car, but the warranties and other technical issues are spelled out differently, depending on which side of the border your car was intended to go to, for sale. US service recommendations or rules don't apply here, on that basis.

"I wonder why this charte was omitted from the Canadian version." Hmmm?
 
meyerweb said:
Even the Canadian OM uses both KM and Miles.
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True, with KM's first in the Canadian edition. Most of the participants in this thread can't convert on the fly as the change over was in 1977 and they were all 35 y/o...

Good read...

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Ontario cops catch speeding American who thought speed limit was in miles

If you've ever driven through the U.S.-Canada border, you've likely experienced that transition period where your mind must substitute kilometres f...
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MKinOntario said:
Why would you refer to the US manuals, when we're clearly in Canada?
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Because he's American and a smart person and only has the U.S. manuals.
BTW, the chart has an addendum number which refers to the 3 years or whatever comes first..
 

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