Tranny fluid backing up the dipstick - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Suicide-D · 08-05-2002, 01:29 PM

What would casue the transmission fluid to back up and out the dipstick? I have not added any since I got the truck and have only been driving it a couple of days. not very far each trip either. I drove it to get it inspected (it passed WoooHooo) and notice a nice big puddle and a few little puddles since then.

Thanks

HuggerCST · 08-05-2002, 01:47 PM

Dirt dobber clogged up the vent tube possibly?

Suicide-D · 08-05-2002, 01:51 PM

plenty of them everywhere.... I wonder???

Suicide-D · 08-05-2002, 04:21 PM

i think it was over full? hope there is nothing wrong internal

**COBALT** · 08-05-2002, 04:26 PM

Overfilling it could sometimes be as bad as underfilling it. It's a good way to bust a seal, or pop the pan gasket. It will sometimes shift rough.

When you're putting fluid in it how are you checking the level? You know there's only 1/2 quart difference between the ADD and FULL marks, don't you?

Suicide-D · 08-05-2002, 04:45 PM

I haven't added any... check in park with a warm engine... it just regurgitated this fluid today after a short drive.

**COBALT** · 08-05-2002, 05:04 PM

Hmmm...how's it shifting? How's the detent?

Suicide-D · 08-05-2002, 05:09 PM

it is shifting fine, has a th400 and has a kickdown switch no cable.

**COBALT** · 08-05-2002, 05:23 PM

That's wierd. My 400 was overfilled once on accident, and it never belched out the dipstick tube.

What I meant by detent is does it shift ok when you kick down into lower gears under harder acceleration? Maybe one of your servos is refusing to actuate, and is causing significant back-pressure??? or you have some kind of problem with your valve body...just a guess.

Southpa · 08-05-2002, 05:28 PM

There is (should be) a full "hot" mark on the dipstick. Perhaps the previous owner filled it to that mark when it was cold. But it still shouldn't be puking out the tube.

XXL · 08-05-2002, 05:33 PM

Many moons ago I had a TH350 that did that... the guy I bought it from did a drain and fill (he didn't realize there was a filter in there-- either that or he wanted the fluid to be pretty when I checked the dipstick). Anyway, after it warmed up it started urping up the tube, then spewing on the manifold and causing much smelly smoke. When I got it home, after much troubleshooting, I yanked the pan and found a filter that looked like it had been breaded with catfish batter and left in the fryer too long. It was nasssssty. Anyway, swapped filters out, refilled and no more problems... that is, until I was "power shifting" the Camaro floor shifter he had hacked into the truck and zinged through neutral and straight into reverse. It was kind of cool for about 1/16 of a second until I realized that I had just whacked my transmission.

Kenneth

08-05-2002, 01:29 PM	#1
Suicide-D Registered User Join Date: Jan 2001 Location: Katy, TX...but the love of my life resides in Dublin,OH. Posts: 1,408	Tranny fluid backing up the dipstick What would casue the transmission fluid to back up and out the dipstick? I have not added any since I got the truck and have only been driving it a couple of days. not very far each trip either. I drove it to get it inspected (it passed WoooHooo) and notice a nice big puddle and a few little puddles since then. Thanks

08-05-2002, 01:47 PM	#2
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	Dirt dobber clogged up the vent tube possibly? __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

08-05-2002, 01:51 PM	#3
Suicide-D Registered User Join Date: Jan 2001 Location: Katy, TX...but the love of my life resides in Dublin,OH. Posts: 1,408	yes I did find.... plenty of them everywhere.... I wonder???

08-05-2002, 04:21 PM	#4
Suicide-D Registered User Join Date: Jan 2001 Location: Katy, TX...but the love of my life resides in Dublin,OH. Posts: 1,408	no one has heard of this? i think it was over full? hope there is nothing wrong internal

08-05-2002, 04:26 PM	#5
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Overfilling it could sometimes be as bad as underfilling it. It's a good way to bust a seal, or pop the pan gasket. It will sometimes shift rough. When you're putting fluid in it how are you checking the level? You know there's only 1/2 quart difference between the ADD and FULL marks, don't you? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

08-05-2002, 04:45 PM	#6
Suicide-D Registered User Join Date: Jan 2001 Location: Katy, TX...but the love of my life resides in Dublin,OH. Posts: 1,408	. I haven't added any... check in park with a warm engine... it just regurgitated this fluid today after a short drive.

08-05-2002, 05:04 PM	#7
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Hmmm...how's it shifting? How's the detent? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

08-05-2002, 05:09 PM	#8
Suicide-D Registered User Join Date: Jan 2001 Location: Katy, TX...but the love of my life resides in Dublin,OH. Posts: 1,408	. it is shifting fine, has a th400 and has a kickdown switch no cable.

08-05-2002, 05:23 PM	#9
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	That's wierd. My 400 was overfilled once on accident, and it never belched out the dipstick tube. What I meant by detent is does it shift ok when you kick down into lower gears under harder acceleration? Maybe one of your servos is refusing to actuate, and is causing significant back-pressure??? or you have some kind of problem with your valve body...just a guess. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

08-05-2002, 05:28 PM	#10
Southpa Registered User Join Date: May 2000 Location: Victoria, BC, Canada Posts: 2,409	There is (should be) a full "hot" mark on the dipstick. Perhaps the previous owner filled it to that mark when it was cold. But it still shouldn't be puking out the tube. __________________ 1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first.

08-05-2002, 05:33 PM	#11
XXL Señor Member Join Date: May 2002 Location: Edge of the world Posts: 5,367	Many moons ago I had a TH350 that did that... the guy I bought it from did a drain and fill (he didn't realize there was a filter in there-- either that or he wanted the fluid to be pretty when I checked the dipstick). Anyway, after it warmed up it started urping up the tube, then spewing on the manifold and causing much smelly smoke. When I got it home, after much troubleshooting, I yanked the pan and found a filter that looked like it had been breaded with catfish batter and left in the fryer too long. It was nasssssty. Anyway, swapped filters out, refilled and no more problems... that is, until I was "power shifting" the Camaro floor shifter he had hacked into the truck and zinged through neutral and straight into reverse. It was kind of cool for about 1/16 of a second until I realized that I had just whacked my transmission. Kenneth __________________ Craigslist \| ebay \| Engrishtees \| www.myattitudesucks.com \| Follow me on Twitter



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