If I add a quart of trans fluid to my transmission and later on change the DCT filter does that extra quart drain out or stay in the gearbox? Ie all over the floor or what. Thanks

 

You’ll lose a few ounces no matter the fluid level.

 

Nope the filter is in it's own attached holder. It drains from the bottom so you will have to add ~8oz of fluid thru the check fluid plug. BUT adding a full quart can't be done from the check level, proper fill level plug. GM's approved method to add 2 quarts of "overfill" and all most dealer's will use for safety reasons requires a lot of work to:

• Remove the Trunk liner
• The remove the air filter box
• Being careful as wires attach to the box and some have broken the clips
• Remove the plug that was only designed to fill the DCT when manufactured.

GM in some late testing on a turn like the Laguna Seca Corkscrew when you are going downhill and turning at a high "g" came up with the Band-Aid 2 quart overfill.

Recently Harlan Charles supported by Josh Holder said they were overly cautious and MOST Trackers would NOT have encountered any issues. Yep if racing at Laguna Seca, using Slicks AND are a very skilled driver, perhaps you might have gotten a Limp Home CEL and had to crawl back to the pits. The DCT has 3 protective sensors if pressure goes low.

Why add anymore fluid just increasing internal Drag! Yep if Tracking GM said use 2 extra quarts. But Harlan Charles supported my Josh Holder recently said they were overly cautious and MOST Trackers would never see an issue. Unless you are racing in a turn like the Laguna Seca Corkscrew when you are going downhill and turning at a high "g" (assuming you are on racing slicks and are very skilled) it's a none issue.


Plenty of fluid as Tremec designed. When DCT filter cover is removed 6 to 8 oz will come out and replaced thru check/level and normal fill plug.


0.2 Liters = 7 oz

 

2 liters of dct fluid for track use in 2020-2023 C8's without the modified case is not "overfill". It's track fill. Overfill continues to have a negative connotation of which there isn't any evidence of "harm" with this as opposed to engine, rear differential, automatic and manual transmissions. So for folks that track your C8 with a DCT that, per GM, requires the 2 additional 2 liters, put it in. It's not "overfilled" in this scenario.

 

And no matter what Jerry says it can be added through the side check port. Whether or not that’s not the way Chevy would do it is immaterial. Jack the drivers side up 12” and fill to the fill port.

So much misinformation.

The track fill made my car run smoother.

 

Same when I did mine.

 

"Jerry" was the first to document, with a SWAG, what angle it would take to fill by "titling! Note the date of my Post, June 9, 2020! I like others was trying to figure out WHY GM was "Overfilling." And Overfill is NOT my word. It was used by Aaron Link (Global Vehicle Performance Manager, Chevrolet Performance Cars) when he described the new 2024 case (and some 2023 DCT cases) that did not require as he stated the "Overfill."

After posting a number of times I saw folks trying, using totally unsafe jacking methods. That was followed by Chuck the Tech where Conti is a salesman who said, "no way" would I jack a car that way in this shop. I know my C8 Trained excellent Tech would also NOT do that in their shop. So a few years ago I stopped posting the idea or posted like here with a Stop Symbol. There are some other ways as used at Ron Fellows but unless doing often probably not worth the cost.

In ~2020 the only reason given my GM and NOT any senor management was at a Carlisle PA Lecture where the fellow reportedly said need "IF you are going downhill and turning the fluid could go to the top of the case." Assume he meant the fluid could leave the Pick-up! It was obvious front the "take the car apart method" they recommended be used, that GM found and issue late in Testing and recommended that Bad-Aid 2 quart "Overfill." I instantly thought of my friend Tom who I saw go down the Laguna Seca corkscrew in his Vintage Maserati Birdcage many times.
Just recently Harlan Charles supported by Josh Holder (or his independent statement) said they were overly cautious and few Tracking would ever encounter an issue with the standard fill.

My friend and Collogue in the welding business driving his 1960 Maserati "Birdcage" down the Laguna Seca Corkscrew. Tom was an aggressive driver and recall one time seeing the *** end slide out in that turn!


Tom was born the same year as me. Unfortunately he died unexpectedly in 2010. He also raced a car at Laguna Seca not good on that Track. He had it fully restored with from a reck he found in Europe. A1951 Cunningham that raced at Le Mans. Better suited for that long track with high speed sections as it weighed 3450 lbs with it's 5.4 Liter Chrysler Hemi compared to the 1300 lb Maserati! Tom would be in the lead of his class coming down the straight and the turn after the Andretti Hairpin close to last! Recall telling Tom he needed to put on different brake shoes BUT he wanted to feel exactly what racers of the day felt!
This Pic is from a book his son produced. The inscription to me says, "See the Welding Bus is Not Bad!" He had the cars before but had just sold his multistore welding supply business for $30 million.

 

So stop saying it can’t be done because obviously it can be.

 

I not only have never said it can't be done you can search and see my June 2020 post that said how many degrees. It's foolish folks that did not lift safely that made me stop posting, later added the NOT. But when I post with NOT it's always that Safety caution. If folks have a Quick Jack that will work.

BUT unless Tracking would NOT recommend as I have after investigating AND now reinforced with Harlan Charles and Josh Holder comments!

 

Yeah - so is it "overfilled" if its not added for purposes of track use then? I think maybe the argument would be no, because in the instructions for returning to street use, it says that the 2 liters can be left in.

But there is evidence of a potential issue with sustained high speed driving - and in that scenario Josh Holder specifically advised the owner to remove the track fill.
https://www.corvetteforum.com/forums...-engineer.html

 

Ok, yes, one instance of the 6th gear throwing hot fluid on the temp sensor causing the system to pull power. Sustained high speed runs which is very atypical. I still maintain that referring to the extra 2 liters as “overfill” is inappropriate and not helpful.

 

“BUT adding a full quart can't be done from the check level, proper fill level plug.”

Yes we know yours and the silent majority opinion.

 

As I mentioned NOT my word it is what Aaron Link (Global Vehicle Performance Manager, Chevrolet Performance Cars) said in a Video when discussing why it was not needed in the new DCT case. Also with the recent comments by Harlan Charles and Josh Holder saying, looking back they were overly cautious and MOST trackers would not have issues with the standard fill, I think "overfill" is fair.

BUT I agree as GM specified, albeit being overly cautious, Track Fill is more accurate!

 

Let’s get back to the OP in the first thread. If I change the trans filter I should simply add a few oz’s in the side fill until it runs out, correct? Assuming the car is level.

 

If you have a normal fill that is correct (but you need to run it through the gears to get the fluid circulated through the filter before you top it off). However if you have more fluid in the DCT than a normal fill then the additional fluid will drain out when you remove the side plug if the car is level. Many people with a more than normal fill just ignore the topping off when changing the filter.

 

Adding to that - the Transmission Fluid Level Check procedure says that the transmission fluid temperature should be between room temperature and 104 degree (in others word cool).
"The transmission fluid level must be checked when the transmission fluid temperature (TFT) is between 20-40°C (68-104°F). If the
TFT is not within this range, either idle or brake torque the vehicle to raise the fluid temperature, or shut off the vehicle to allow the fluid to
cool as required. Setting the fluid level with a TFT outside this range will result in either an under or over-filled transmission. TFT greater
than 40°C=under-filled, TFT less than 20°C=over-filled. An under-filled transmission will cause premature component wear or damage.
An over-filled transmission will cause fluid to discharge out the vent tube, possibly causing a fire that may result in serious bodily injury or
severe vehicle damage, fluid foaming, or pump cavitation."

Considering that the track fill add 2 full liters to the standard fill, I really doubt seriously that you can overfill it because the fluid was too cold. But I do think it might be underfilled if you do the level check when the fluid is too hot. Is it enough to worry about - well whats the point of topping it off anyway then? There have been one or two forum reports where the dealer actually noted on on the invoice that the level check was done after the transmission fluid was cool - so some do follow the procedure.