Will my overfilling of the transmission cause damage? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Transmission Mods Performance Transmission Modifications

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  #1  
Old 06-10-2010, 01:20 AM
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Will my overfilling of the transmission cause damage?

Yesterday I installed a transmission cooler, did a transmission fluid exchange with Amsoil Dex-VI and left it a bit overfull. I measured the dipstick while hot and idling in Park, and it's exactly 2" higher than the highest dot ("full" mark). I know the dipstick is on a decent angle, so 2" might not be that much extra fluid, but I wanted to see what everyone else thought. Do I need to go through the trouble of trying to drain a quart or so or can I just leave it?
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  #2  
Old 06-10-2010, 01:34 AM
WOOLUF1952 WOOLUF1952 is offline
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First thing to do is, find someplace level, to make sure it is actually that much over filled. Two inches over full is a lot.

If you need to drain some fluid, you should be able to get a small tube down the fill tube and siphon some out.
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Old 06-10-2010, 08:18 AM
Wex Wex is offline
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If you can not siphon, maybe pull a line off your cooler and drain a bit from there.

Pics of your coolers location please. I, one day might add a cooler myself.
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Old 06-10-2010, 08:44 AM
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In answer to your question, if a transmission is way over-filled (yes, 1qt can matter), and the fluid is up far enough, it will be foamed up by the rotating gears, and will put foamy fluid through the trans, which will cause clutches to slip, and some things to be controlled "funny" because of the air in the system...

Mike
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Old 06-10-2010, 12:05 PM
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Thanks for all the help guys. I'll drain some out then (although I have no idea how much 2" is, but I'll start w/ a quart). I'll also upload some pics of the cooler, as finding a suitable location was a bit challenging.

This is the cooler I bought, and it really comes with everything you need except this GM adapter:
http://www.amazon.com/gp/product/B000CIGE9G/ref=oss_product

It's 11" x 7-1/4" x 3/4" which is the largest I read would fit (and I believe that). I don't have an ATF temp gauge to give you before and after readings, as I'm just trusting it'll extend the life of the tranny regardless of temps.
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Old 06-10-2010, 12:14 PM
mazingerz mazingerz is offline
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overfilling the trans will put more stress on the seals and eventually break them, you will then get an oil leak.
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Old 06-10-2010, 12:17 PM
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Quote:
Originally Posted by mazingerz View Post
overfilling the trans will put more stress on the seals and eventually break them, you will then get an oil leak.
Incorrect. See my post above.

Mike
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Old 06-13-2010, 12:27 PM
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Pics as requested...



I had to bend the included bracket 90* to make it work (and use two for added length)...



The other bracket was on a 45* angle from the upper hood latch bolt:




Then I used this barb adapter to convert the original radiator output to a standard barb fitting, which I hooked the cooler input hose to. The hose coming out of the cooler was hooked to the original barbed tip of the steel line going back to the transmission. I also cut away some of the plastic to make more room, and will add wire loom soon.



Then I painted the steel bracket black, and put everything back.



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Old 05-31-2013, 12:46 AM
zammer zammer is offline
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Yes old thread, but I did something stupid today and overfilled my trans by 4 quarts. I thought i lost tons putting in a trans cooler today because I had a mixture of coolant and trans fluid because the O rings on the trans cooler let go.
Anyways I drove it over filled for a mile and it started acting bad. I drained all the excess out and it dosent want too take off from a stop when I hit the gas it slips bad. Did I kill this Trans?
Kicking out the po 976 code. Please help I'm hooped as this is my main family vehicle
Thanks!
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