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Engine/Transmission (1998.5 - 2002) Auto transmission fluid draining down??

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I'm guessing that the fluid is draining down in my auto transmission.

After it has sat over night, it will pull out of the driveway and move about 50-100 feet. Then it will quit pulling, like as if the hydraulic pressure on the bands was suddenly dumped. I just let it keep idling and in about 5 seconds or so, it catches again and no more problems all day.

The truck has about 2,000 miles or so since the new TC/VB was installed. I am very short on extra cash (read none) and decided to short change doing a full transmission upgrade.

I have tried letting it idle for about 5 minutes before pulling out of the drive with no apparent difference in the way it does this. Also, have gone back and forth between reverse to drive, cycling the transmission that way to see if it would work out the air bubble to no avail.

It did not do this before the filter was installed, which was about 1,500 miles after the TC/VB was installed. The filter was installed because there was metal showing up in the pan and I assumed that we did not get the transmission cooler & lines completely clean. At least I hope that is where the metal is coming from.

The transmission shifts are very positive (too hard some will say) with no slipping. Upshifts and down shifts are near perfect. I bought the lowest stall speed TC that Suncoast Converters offers because 99. 5% of my driving is below 50 mph and I wanted the TC locked up at 40 mph. At idle, it will shift up through the first 3 gears and eventually do about 15 mph or so after the TC locks up. The TC unlocks at the slightest touch of the go pedal and it downshifts perfectly.

I have installed a 1 quart oil filter in the return line from the factory transmission cooler. I'm wondering if maybe that is bleeding down and causing the problem. However, I'm under the impression that that line just dumps into the pan?

So, what is your consensus on what I have described? The filter bleeding down (it is horizontal just below radiator) and creating an air pocket, or with 118,000 miles on it, are the internal seals suspect? No seals were changed in the transmission except for the one on the front shaft.

Don't want to take it out again unless it is just absolutely necessary. The weather here is a lot colder than my knees enjoy lately <!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> <v:stroke joinstyle="miter"/> <v:formulas> <v:f eqn="if lineDrawn pixelLineWidth 0"/> <v:f eqn="sum @0 1 0"/> <v:f eqn="sum 0 0 @1"/> <v:f eqn="prod @2 1 2"/> <v:f eqn="prod @3 21600 pixelWidth"/> <v:f eqn="prod @3 21600 pixelHeight"/> <v:f eqn="sum @0 0 1"/> <v:f eqn="prod @6 1 2"/> <v:f eqn="prod @7 21600 pixelWidth"/> <v:f eqn="sum @8 21600 0"/> <v:f eqn="prod @7 21600 pixelHeight"/> <v:f eqn="sum @10 21600 0"/> </v:formulas> <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> <o:lock v:ext="edit" aspectratio="t"/> </v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" alt="" style='width:12pt; height:12pt'> <v:imagedata src="file:///C:/DOCUME~1/jcraig/LOCALS~1/Temp/msoclip1/01/clip_image001.gif" o:href="https://www.turbodieselregister.com/images/smilies/rolleyes.gif"/> </v:shape><![endif]--><!--[if !vml]-->:rolleyes:<!--[endif]--> and I really don't have the tools anyway. A thief saw to that about 2 months ago and I haven't restocked yet.
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Comments please. :)
 
Sure sounds like an internal seal allowing fluid to leak out of the torque converter after standing for a while.



I had an old '58 or so chevy that did that. I bought and added a brand name auto transmission seal restorer, and the problem slowly faded away, until by the 3rd day it was shifting good as new. No, I don't remember the brand of stuff I used - too many years ago, but that sure would be my first try if it happened again.
 
I wouldn't recommend any trans sealer type additive. From what I've learned over the years is sealer basically expands the rubber of the seal and then the rubber weakens and then - pull transmission for a rebuild or at least all new seals . . . at that point might as well do a rebuild.



Have you tried lettting it warm up in drive a few minutes before heading out of the drive?
 
Have you tried lettting it warm up in drive a few minutes before heading out of the drive?



You musta missed this part of his post: ;)



I have tried letting it idle for about 5 minutes before pulling out of the drive with no apparent difference in the way it does this. Also, have gone back and forth between reverse to drive, cycling the transmission that way to see if it would work out the air bubble to no avail.
 
There is a check valve that is supposed to keep the fluid from draining back into the transmission. It is located at the transmission water heat exchanger. Might be something to investigate.



IF the T/C drains down, I would have no idea of how long a time in idle it would take the transmission pump to fill it back up. Maybe 5 minutes is not enough?



Bob Weis



EDIT I have a DTT transmission and the pump fills the T/C in park unlike the OEM transmission. I forgot this feature in the above response.
 
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A stock transmission needs to be in neutral to refill the converter.

The longest I have seen was about 45 seconds. BTW, that trans is still working. It is in a Dakota with 160,000 on it. The truck has 301,000 miles.
 
Hmmm, haven't tried putting it in neutral to let it fill the TC back up. will do that in the morning before pulling out.

Wasn't aware of the drain back valve. Have a manual on video tape, but haven't looked at it yet.

Thanks for the comments. It is very aggravating, but if it never gets any worse, I will just live with it.

Anyone have anything else to add on this?
 
I've had 92 CTD that did the same thing. The fix was to just put it in neutral and it will fill the converter back up and away you go till the next night. It only has to pump in neutral for a few seconds.
 
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