Overfilled transmission?

**gmrulz4u** · 07-18-2005, 08:55 AM

I checked my transmission fluid the other day and noticed it was about 2 inches above the top line of the XXXXXXXX on the dipstick. So basically it was 2 inches too high.

Is this really a bad thing? How many quarts overfilled would this translate to?

I have noticed for a while that once my tranny gets hot, it shifts badly and erratically. Maybe this is the problem? Maybe the fluid is becoming to airated and bubbling etc.?

It's an 89 Cutlass with the 4T60(440-T4).

**GutlessSupreme** · 07-18-2005, 09:12 AM

Did you check it when it was hot? or cold?

**gmrulz4u** · 07-18-2005, 09:42 AM

Hot, idling, after driving for 20 minutes or so...I'm aware of the proper process for checking it from reading the owners manual, Haynes, and this site etc.

**bartonmd** · 07-18-2005, 11:47 AM

Yes, it is bad... you are correct, the fluid will aerate and trans pressure will go to shit, much like you had too low fluid... and it will help to burn up your clutches...

I have over-filled a couple... My advice would just be to stick a hose down the dipstick tube and suck the fluid out... it'll keep you from having to re-do the pan gasket anyway...

BTW, you may be 2 qts too full... depending on whether it's aerated when you check it or not...

Mike

**JoroCorona** · 07-19-2005, 10:05 PM

Yeah, get some of the fluid out of there before it airates bad enough to burst some seals.

**GutlessSupreme** · 07-20-2005, 01:00 AM

Originally Posted by gmrulz4u

Hot, idling, after driving for 20 minutes or so...I'm aware of the proper process for checking it from reading the owners manual, Haynes, and this site etc.

Sorry, didn't mean to make you out to be an idiot or anything

just never know exactly how mechanics-literate people are

**SigEpCutlass** · 07-20-2005, 07:56 AM

Originally Posted by gmrulz4u

I checked my transmission fluid the other day and noticed it was about 2 inches above the top line of the XXXXXXXX on the dipstick. So basically it was 2 inches too high.

Is this really a bad thing? How many quarts overfilled would this translate to?

I have noticed for a while that once my tranny gets hot, it shifts badly and erratically. Maybe this is the problem? Maybe the fluid is becoming to airated and bubbling etc.?

It's an 89 Cutlass with the 4T60(440-T4).

Two inches higher on the dipstick is a lot of fluid. I don't know if it's 2quarts like someone suggested, but I'd get that extra fluid out of there ASAP!

**bartonmd** · 07-20-2005, 11:29 AM

Originally Posted by SigEpCutlass

Originally Posted by gmrulz4u

I checked my transmission fluid the other day and noticed it was about 2 inches above the top line of the XXXXXXXX on the dipstick. So basically it was 2 inches too high.

Is this really a bad thing? How many quarts overfilled would this translate to?

I have noticed for a while that once my tranny gets hot, it shifts badly and erratically. Maybe this is the problem? Maybe the fluid is becoming to airated and bubbling etc.?

It's an 89 Cutlass with the 4T60(440-T4).

Two inches higher on the dipstick is a lot of fluid. I don't know if it's 2quarts like someone suggested, but I'd get that extra fluid out of there ASAP!

It depends on whether he's up into the valve body or something at that point... When mine was in inch high after a fluid/filter/gasket change, it was a bit over a quart of fluid high. It has been my experience that most stuff on cars is 1" = 1 qt. just as a SWAG number...

Mike

Mike

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