General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

The Debate about Overfilling a transmission? Which is true?

Thread Tools
 
Search this Thread
 
Old Jul 12, 2005 | 08:47 PM
  #1  
h1081dan's Avatar
Thread Starter
Senior Member
Posts like a Corvette
 
Joined: Aug 2003
Posts: 1,205
Likes: 0
From: Elizabethtown Pennsylvania
h1081dan is on a distinguished road
Default The Debate about Overfilling a transmission? Which is true?

Ok whats the story? I have hear many people online say not to do it, it will mess up your trans. The other half says overfilling does not harm your transmission. Which is it?? I currently do not currently have an overfilled trans, however I would like to know which is the right answer. Expecially since I sometime have had my trans over filled.
Old Jul 12, 2005 | 08:48 PM
  #2  
opensourceguy's Avatar
Senior Member
True Car Nut
 
Joined: Apr 2004
Posts: 4,879
Likes: 4
From: Three Oaks, Michigan
opensourceguy is on a distinguished road
Default

Don't do it, but don't do it minimal. Like whenever I fill up my transmission fluid, and engine oil, i always fill it up to 3/4 full on the cross hatched area. That way it won't be low, and not overfilled. It'* the best, IMO

When/why is your trans overfilled?


-justin
Old Jul 12, 2005 | 08:51 PM
  #3  
h1081dan's Avatar
Thread Starter
Senior Member
Posts like a Corvette
 
Joined: Aug 2003
Posts: 1,205
Likes: 0
From: Elizabethtown Pennsylvania
h1081dan is on a distinguished road
Default

Originally Posted by opensourceguy
Don't do it, but don't do it minimal. Like whenever I fill up my transmission fluid, and engine oil, i always fill it up to 3/4 full on the cross hatched area. That way it won't be low, and not overfilled. It'* the best, IMO

When/why is your trans overfilled?


-justin
Trans was overfilled a while ago. Hasn't been for a while. I was just wondering just for the sake of having the right information which is right.
Old Jul 12, 2005 | 09:07 PM
  #4  
1993 SLE's Avatar
Senior Member
Certified Car Nut
 
Joined: Oct 2003
Posts: 19,756
Likes: 1
1993 SLE is on a distinguished road
Default

i would rather have more fluid than less, if that is what it came down to
Old Jul 12, 2005 | 09:09 PM
  #5  
toastedoats's Avatar
Senior Member
True Car Nut
 
Joined: Sep 2004
Posts: 6,837
Likes: 3
From: Fitchburg Ma _ToastedRice_
toastedoats is on a distinguished road
Default

some trannys will just puke it out if its REALLY high.. not sure about the 4T6* series
Old Jul 12, 2005 | 09:22 PM
  #6  
opensourceguy's Avatar
Senior Member
True Car Nut
 
Joined: Apr 2004
Posts: 4,879
Likes: 4
From: Three Oaks, Michigan
opensourceguy is on a distinguished road
Default

Originally Posted by 1993 SLE
i would rather have more fluid than less, if that is what it came down to
Yep yep, I will agree with that. I think the tranny could handle an extra quart, but past that I think toast is right in that it would just puke it out. If it has nowhere else to go, ya know? Where is it supposed to go?


-justin
Old Jul 12, 2005 | 11:18 PM
  #8  
Logan's Avatar
Senior Member
Certified GM nut
 
Joined: Feb 2004
Posts: 2,246
Likes: 0
From: MI
Logan is on a distinguished road
Default

While on the topic sorta...what about engine oil? How full is too full?

Someone I know with an oil and filter change does 4 quarts.

Someone else I know (maybe its me ) does 5 quarts.

Manual says 4, but up to one more with filter change.
Old Jul 12, 2005 | 11:36 PM
  #9  
opensourceguy's Avatar
Senior Member
True Car Nut
 
Joined: Apr 2004
Posts: 4,879
Likes: 4
From: Three Oaks, Michigan
opensourceguy is on a distinguished road
Default

err.. LE/SE is 4, SSE is 5.5 [for 89 taht is]. Makes no sense.. but as long as when the engine has been driven [10 mi is probably all needed], then cooled down, and it'* in the mid of crosshated its good. Doesn't matter about quantity, more about level. Sometimes my car only wants 3.5 quarts, sometimes it wasts 5. Just gotta conform.


-justin
Old Jul 12, 2005 | 11:46 PM
  #10  
LakevilleSSEi's Avatar
Senior Member
True Car Nut
 
Joined: Sep 2004
Posts: 9,130
Likes: 0
From: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
LakevilleSSEi is on a distinguished road
Default

The car wants four....after you put five in, because the filter is empty when you install it, and most filters will hold a qt alone.

If you were to over fill your trans, amongst what Don had mentioned about your trans pissing it out all over the place, and prolly burning your car to the ground.....You could blow out internal o-rings and possibly external seals and cause a premature trans failure.



All times are GMT -4. The time now is 06:42 AM.