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Old 02-23-2010, 10:28 AM
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trans dumping fluid

this happens in three vehicles i've had , Chevrolet's.
sit in shop for months no leaks , then walk in and two quarts or more are on floor .
sometimes it does it in one day over night .
tired of panning it for the bugs to die in .

concrete drawing it ?
torque converter draining back in tranny pan ?
replaced seals , trans shop even had a go at it , still leaks .

thanks in advance
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Old 02-23-2010, 07:24 PM
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If it's not a Trans seal, may be the Driveshaft Yoke. Some have a vent hole that can be plugged.
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Old 02-23-2010, 07:34 PM
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Check your dip-stick tube . Could be the O-Ring What trans is it? where exactly is the fluid located at on the floor Front/Rear/Driver side/ Passenger side?


Cole
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Old 02-23-2010, 09:09 PM
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trans dumping fluid

thats not the problem i'm told , seals and o rings changed by guaranteed shops , i've done them till tired of it .
get them right , then it comes out the shifter linkage .
had it come out the yoke behind the u joint .
if you know trans , then you know that fluid level is lower than the center of yoke .
never overfilled either .
it dumps enough that it barely pulls in gear .
add fluid to full , drives fine .
till you park it .
like i said , it might leak that night , or months down the road .
but in garage only .Why ????
this one them drive you crazy .
open shop to show your toys , and walk into a big mess to clean up .
them trans pans not tall enough for what dumps out .
could it be the calcium in the concrete ????
the check ball that is in pump letting the converter drain half back into filter pan of trans ???
not the vent tube .
i even had a transmission shop try twice and then replaced with another trans they got from a supplier that was new , not rebuilt .
it leaked it out in three days .
yes they gave up and gave me the trans , instead of trying again .

sorry for the long story , but what is it .
my wrecker is a 73 chevy , not a rust spot on it , never had to do any rust patching .sitting in a puddle or with a huge pan i made under it .

crozley , i read your answers and hear lots asking you , i don't want to put it out in weather , what do you think it is ?
i've even parked it over layers of carpit and cardboard stacked .
big diaper mess .
loss a 69 chevy truck in fire i had , the fluid in that diaper , melted truck worse than if it would of been on just the concrete .
that's why i don't do that any more .

any answers , highly appreciated .
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Old 02-23-2010, 09:35 PM
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Quote:
Originally Posted by burnt olds
crozley , i read your answers and hear lots asking you , i don't want to put it out in weather , what do you think it is ?
i've even parked it over layers of carpit and cardboard stacked .
big diaper mess .

Quite simple to answer.

Every thing at the front of the trans has clearance in it. Pump gears, bushings, input shaft, stator support, converter, cooler system for the trans. All transmittins drain back at different rates. Some cooler systems have drain back valves in-line for this reason

the trans oil will drain slowly back to the trans pan and fill up. Once some air gets into the converter = behind the fluid , fluid drains much quicker.

It is the same principle as a drain in a house. If there is no air behind the liquid , the drain is slow. If there is air behind the fluid ( A vent in the plumbing system) the fluid flows faster.

So.. there is not much drain back at first, then air gets inside the converter and POOF over nite the mess is there
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Old 02-23-2010, 09:52 PM
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trans dumping fluid

ok
then why on all my trucks do it ?
my olds never dripped , had three 67 olds , never did this .
82 chevy did it over night every nite .
never out in driveway .
my 69 tubbed , burnt truck , over a month .
my 73 wrecker , like i said , at many diferent times .
it's empty now to where i have to add fluid to move .
hair puller for me .
my 84 blazer never drips , put it in garage and it drips out the transfer case .

i have a 2000 dually , never tried it .
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Old 02-24-2010, 08:26 AM
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Quote:
Originally Posted by Crosley
Quite simple to answer.

Every thing at the front of the trans has clearance in it. Pump gears, bushings, input shaft, stator support, converter, cooler system for the trans. All transmittins drain back at different rates. Some cooler systems have drain back valves in-line for this reason

the trans oil will drain slowly back to the trans pan and fill up. Once some air gets into the converter = behind the fluid , fluid drains much quicker.

It is the same principle as a drain in a house. If there is no air behind the liquid , the drain is slow. If there is air behind the fluid ( A vent in the plumbing system) the fluid flows faster.

So.. there is not much drain back at first, then air gets inside the converter and POOF over nite the mess is there

Crosley, so what is the cure ? Another rebuild ? Lots of us turbo 350 owners need some answers.

Thanks


454 RATTLER
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Old 02-24-2010, 11:05 AM
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I've had two different trannys pull this same stunt.

The only things similar between them was a LONG period of sitting uncranked and undriven.

One was an original '80 TH350C, the other a '95 4L60E in a GMC truck, behind a 4.3L V6.

Neither lost so much as a single drop- until they sat. As long as they were driven weekly (or there abouts), the leakage wouldn't happen. Let it sit long enough, and it would over a period of days lose a LOT of fluid- to the point of no drive when the tranny was engaged. Took like 4-5 qts. sometimes to top it up.

Seems that once the leakage first started, it took less time for it to reoccur.
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