I would say10mm above the dot. Is that bad? Is that going to cause any issues? Tranny not slipping though.

 

The fluid level according to the manual should be in between the dots. Overfilled is not too bad, low on the dip stick is. If it bothers you crack open the tranny drain bolt and let enough come out to get closer to the top or middle mark on the dip stick.

 

When I had my trans rebuilt locally, the owner/mechanic overfilled my trans by 10mm which equated to 1 quart of trans fluid. When I mentioned this to the owner/mechanic he stated that these transmissions could benefit from more fluid.
Since the owner/mechanic is giving me a warranty, I left the fluid level alone. After 30K+ miles later the trans is still performing like new. I have changed the fluid & filter after 30K miles and "overfilled" the trans by 1 quart.

 

Recheck the fluid level. Drive the car around for awhile in a spirited manner and then after parking the car on a level area, shift the tranny through all of it's gears a couple of times. Shut the car off and then check the tranny dipstick twice. The level is recommended by the factory to be within the dots. I can't see any benefit to being overfilled, but IDK for fact.

 

Nope... If you pour 3 exact Quarts it should be in the middle of the dots.. Another 1 Q should raise it way beyond the upper dot even when hot.

 

Never trust the mechanic. He didn't have to do anything or admit wrong doing by saying so. If it was 3 quarts over, he would say the same too.

 

The second replacement transmission that went into my Accord was overfilled by the dealer. I found out about 6 months later, after going in for something unrelated. I had checked the level myself but wasnt doing it the "right way" per the forums, so it always looked OK to me.

Service paperwork said they drained 1.5 quarts out to get it to correct level. They couldnt tell me if it would cause any issues, but after 30K miles on that transmission I had none (sold the car, it was still working OK)

 

Overfilling a transmission is very bad. It causes the oil to foam, which causes the pressure to drop. That is about the fastest way to kill an automatic. Same goes for the engine oil, for that matter.

 

When my transmissions were under the Acura warranty, I kept them at the factory correct level, changed the fluid every 30K miles and used only Honda ATF. With that method I couldn't get 100K out of the transmission.

Now that I had to pay for the rebuild of my current transmission, I will continue to use Honda ATF (now with DW-1), change the fluid every 30K miles and will overfill the transmission by 1 quart with the intent of preventing burning up the 3rd gear clutch pack.

I do not endorse overfilling the transmission, I am doing this as an experiment to see if I can extend the life of my transmission past 100K miles. So far I am 35K miles with no transmission problems.

 

^^ Your best bet is to install an ATF cooler instead of overfilling..
More HOT ATF = BAD
Enough ATF but Cooler = BETTER

 

My understanding is that an ATF cooler will not help the low flow design problem to the 3rd gear clutch pack.

 

Neither will overfilling... but the cooler actually helps to retain the ATF properties under hot situations. The design problem isn't like ANY ATF isn't touching the clutch pack by the way so overfilling it wont help at all, but the little it does gets extremely hot and starts to make the ATF weaker that leads to a faster failure..


I'm at 100K on my rebuild original trans with 2 trans coolers and regular ATF changes.. can be luck or can be that but either way is still running strong.. fatty can say he had the coolers and what-ever but at least for me the coolers does make the ATF last longer between changes and Im on my second trans at 200K.. Not 3rd or 6th..


Look it like this: You have an OVEN with burning oil then you add more Oil? or you can lower the oven heat? That's my tought about it.


My 2cents

 

Low pressure and low cooler flow are the design flaws of these transmissions, 3rd clutch pack being the furthest from the others required feed pipes along with low flow therefore not making it to the clutch pack on time or at all.
Then you have the classic burned 3rd clutch pack worn out along with a plugged up unserviceable internal filter = Domino effect.
Thats why the 2nd gear oil jet was needed because of low cooler flow.
The problem is in the valve body design, Look up sonnax they can explain most of the issues involved with these transmissions and the fix.

http://www.sonnax.com/parts/2757

Thats my conclusion, I have taken one apart and have some pics.
Overfilling is not a good idea but its your transmission, my last one was overfilled and guess what yep it went.

 

Yeah, inevitably the rebuilt original trannys will fail again.....save up for the improved "AV6" donor !!!