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ToddC
 Post subject: Drainin the tranny
PostPosted: Mon Jul 16, 2001 10:06 am 
Hello all,

I am looking for a good "do it yourself" method to draining and flushing the 904 auto & torque converter in my '64 Valiant.

I dropped the pan Sat., drained it, changed the filter and refilled it, but the fluid still has a lot of the old fluid mixed in. The car has 87k miles with what I perceive to be the original fluid, so I really want to get it all out.

My shop manual shows an access plate and a drain plug on the torque converter, but the access plate is non-existent. I have to detach the engine to transmission bracket to get the plate off (with no guarantee of a drain plug on the other side). Don't know if I want to go that far. Is there another method?

Thanks & regards,
ToddC formerly known as Merganser1

P.S. the Service Manual also says that the transmission should NEVER need servicing under "normal" driving conditions. Ya RIGHT!

cole020@yahoo.com
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Doctor Dodge (Doug Dutra)
PostPosted: Mon Jul 16, 2001 2:25 pm 
Quote:
: I am looking for a good "do it
: yourself" method to draining and
: flushing the 904 auto & torque converter
: in my '64 Valiant.
:
: I dropped the pan Sat., drained it, changed the
: filter and refilled it, but the fluid still
: has a lot of the old fluid mixed in. The car
: has 87k miles with what I perceive to be the
: original fluid, so I really want to get it
: all out.
:
: My shop manual shows an access plate and a
: drain plug on the torque converter, but the
: access plate is non-existent. I have to
: detach the engine to transmission bracket to
: get the plate off (with no guarantee of a
: drain plug on the other side). Don't know if
: I want to go that far. Is there another
: method?
:
: Thanks & regards,
: ToddC formerly known as Merganser1
:
: P.S. the Service Manual also says that the
: transmission should NEVER need servicing
: under "normal" driving conditions.
: Ya RIGHT!


To get at the convert drain plug, you do have to remove the two support bracket bolts and the two smaller dustcover bolts. Yes, that's a pain but it's not all that bad so do it. Once you have the dustcover off, you can take some tin snips and "notch-out" the area where the support bracket holes are and then future cover removals become quick, just remove the two small bolts and slip ith cover out.

Once you have the cover off, you may have to rotate the engine around untill the drain plug is at the lowest point, remove it and let 'er drain for a while. (it goes real slow so if you can let it drain over-night, that's best)
DD
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Craig
 Post subject: Re: Drainin the tranny
PostPosted: Mon Jul 16, 2001 7:53 pm 
This is how I do mine....
Disconnect the transmission oil line at the rear of the transmission. ( The return line coming from the oil cooler in the radiator. The line coming out near the front of the transmission supplies oil to the cooler). Then I slip a piece of hose over the end I just disconnected from the transmission and run it into my drain pan. Then put the transmission in neutral and start the engine. Let it run until the transmission pan is empty. Then I remove the pan, no big oil mess now that I pumped all the oil out of the pan. Install new filter and adjust bands. Then LEAVE THE OIL LINE DISCONNECTED from the transmission and dump in 4 or 5 quarts of new transmission oil. Again, put the transmission in neutral and start the engine. Let it run just long enough for the new oil to flush out the old oil remaining in the torque converter, oil lines, and oil cooler. Then reconnect the oil line and fill the transmission with oil.

This is especially useful if you have a 1979-up car that did not come with a drain plug or a replacement converter that does not have a drain plug.

cfield@ll.net
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Doctor Dodge (Doug Dutra)
 Post subject: Re: Drainin the tranny
PostPosted: Mon Jul 16, 2001 10:33 pm 
Quote:
: This is how I do mine....
: Disconnect the transmission oil line at the
: rear of the transmission. ( The return line
: coming from the oil cooler in the radiator.
: The line coming out near the front of the
: transmission supplies oil to the cooler).
: Then I slip a piece of hose over the end I
: just disconnected from the transmission and
: run it into my drain pan. Then put the
: transmission in neutral and start the
: engine. Let it run until the transmission
: pan is empty. Then I remove the pan, no big
: oil mess now that I pumped all the oil out
: of the pan. Install new filter and adjust
: bands. Then LEAVE THE OIL LINE DISCONNECTED
: from the transmission and dump in 4 or 5
: quarts of new transmission oil. Again, put
: the transmission in neutral and start the
: engine. Let it run just long enough for the
: new oil to flush out the old oil remaining
: in the torque converter, oil lines, and oil
: cooler. Then reconnect the oil line and fill
: the transmission with oil.
:
: This is especially useful if you have a 1979-up
: car that did not come with a drain plug or a
: replacement converter that does not have a
: drain plug.


Great tip, this sure speeds up the process.
Do you end-up using a couple of extra quarts of AT fluid by "flushing" this way?
Remember, always use two wrenchs when removing flair type / tube fittings.
DD
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MRMOPARMAN
PostPosted: Tue Jul 17, 2001 2:03 am 
also while you have the pan off, clean the magnets.. if you dont have any, get some powerful ones to put in!

what that does is picks up any metal filings in the tranny and keeps it from getting sucked back up and/or clogging the new filter

all new trannies have this in them.. and especially the new "sealed for life" trannies!


Mr_Mopar_Man@hotmail.com
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Craig
 Post subject: Re: Drainin the tranny
PostPosted: Tue Jul 17, 2001 6:59 am 
I don't know how much extra new oil I used. You can tell when the new oil is coming out the end of your hose because it is much brighter than the old oil. BE SURE to have your transmission in NEUTRAL when doing this. These Mopar transmissions do not pump / circulate the oil through the oil lines and cooler when in PARK. Also good tip to use two wrenches when disconnecting the oil line. Otherwise you'll twist off your steel line. Ouch!

cfield@ll.net
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Tim_K
 Post subject: Re: Drainin the tranny
PostPosted: Tue Jul 17, 2001 10:38 am 
Quote:
: Hello all,
:
: I am looking for a good "do it
: yourself" method to draining and
: flushing the 904 auto & torque converter
: in my '64 Valiant.
:
: I dropped the pan Sat., drained it, changed the
: filter and refilled it, but the fluid still
: has a lot of the old fluid mixed in. The car
: has 87k miles with what I perceive to be the
: original fluid, so I really want to get it
: all out.
:
: My shop manual shows an access plate and a
: drain plug on the torque converter, but the
: access plate is non-existent. I have to
: detach the engine to transmission bracket to
: get the plate off (with no guarantee of a
: drain plug on the other side). Don't know if
: I want to go that far. Is there another
: method?
:
: Thanks & regards,
: ToddC formerly known as Merganser1
:
: P.S. the Service Manual also says that the
: transmission should NEVER need servicing
: under "normal" driving conditions.
: Ya RIGHT!


Back in 1997, I had a '69 Charger R/T with a 440 and 727. When I got it, it had been sitting for a long time, so all oils got changed. When I went to drain the 727, I got 5 quarts of fluid out of the converter alone, after the pan had been emptied! I also loosened up the valve body and slid out the accumulator, because you can get a lot more fluid out if you do that. I ended up refilling the transmission with almost as much fluid as the books say is the capacity. 17 pints or something like that. 8-1/2 quarts.

Also, when I get a new mopar and am going over it, I always take off the sheet metal shield that covers the converter. If the particular car requires it, I'll cut out the piece that goes under the starter mount and reuse that part. But the converter stays open. I think the extra airflow might help the converter stay a few degrees cooler, and it's just easier to get at everything that way.
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