727 Torqueflight question

Kevin Panzino · 06-28-2020, 02:07 PM

Gents, I have no experience with a 727 transmission.
I have a 1974 IH Scout II with that trans.
If the scout sits for even a few days the converter drains back into the trans overfills it, then leaks on the floor.

Is there a check ball or some other means in the valve body that is supposed to prevent this? It did not do this until recently.

Kevin Panzino

ss3011 · 06-28-2020, 06:02 PM

Where is it leaking from , the pan gasket or dipstick tube ? Best to fix those leaks , not much you are going to do to solve converter draindown .

Myron Piatek · 06-28-2020, 06:49 PM

Also check the case seal where the shift lever attaches to the valve body on the driver's side.

e vassar · 06-29-2020, 03:16 AM

Had 727,s in a couple bracket cars. If i filled them to the exact full mark on the stick, they would leak down to their happy spot. Probably about 1/4 quart then stop. So i finally quit filling them back to the full mark and they would stay right there.

Kevin Panzino · 06-29-2020, 07:57 AM

Ok, I see. It probably always drained back to the trans, just now what has changed is that its leaking. I changed the pan gasket, no love. Hard to see where its coming from because it just runs along the pan rails and drips from the pan bolts.

Gonna take a close look at the dipstick tube seal, and the shifter linkage seal now.

Thank you all for the input !!!

Kp

Jack Zimmerman · 06-29-2020, 11:01 AM

If the dipstick is the 1974 style there is an o-ring on the bottom where it inserts into the transmission unlike the push-in seals that they use today and I've had those o-rings get hard and leak. So the best fix for that is to get a new style seal and dipstick but unfortunately I don't know the part numbers for what you need but maybe someone else knows.

06-28-2020, 02:07 PM	#1
Kevin Panzino Senior Member Join Date: Oct 2002 Location: Pittsburgh Posts: 575 Likes: 298 Liked 747 Times in 136 Posts	727 Torqueflight question Gents, I have no experience with a 727 transmission. I have a 1974 IH Scout II with that trans. If the scout sits for even a few days the converter drains back into the trans overfills it, then leaks on the floor. Is there a check ball or some other means in the valve body that is supposed to prevent this? It did not do this until recently. Kevin Panzino

06-28-2020, 06:02 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: 727 Torqueflight question Where is it leaking from , the pan gasket or dipstick tube ? Best to fix those leaks , not much you are going to do to solve converter draindown .

06-28-2020, 06:49 PM	#3
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: 727 Torqueflight question Also check the case seal where the shift lever attaches to the valve body on the driver's side. __________________ LOCOMOTION Racing

06-29-2020, 03:16 AM	#4
e vassar Member Join Date: Jul 2015 Posts: 380 Likes: 67 Liked 271 Times in 107 Posts	Re: 727 Torqueflight question Had 727,s in a couple bracket cars. If i filled them to the exact full mark on the stick, they would leak down to their happy spot. Probably about 1/4 quart then stop. So i finally quit filling them back to the full mark and they would stay right there.

06-29-2020, 07:57 AM	#5
Kevin Panzino Senior Member Join Date: Oct 2002 Location: Pittsburgh Posts: 575 Likes: 298 Liked 747 Times in 136 Posts	Re: 727 Torqueflight question Ok, I see. It probably always drained back to the trans, just now what has changed is that its leaking. I changed the pan gasket, no love. Hard to see where its coming from because it just runs along the pan rails and drips from the pan bolts. Gonna take a close look at the dipstick tube seal, and the shifter linkage seal now. Thank you all for the input !!! Kp

06-29-2020, 11:01 AM	#6
Jack Zimmerman Junior Member Join Date: Dec 2001 Location: Clemmons, NC Posts: 35 Likes: 0 Liked 11 Times in 6 Posts	Re: 727 Torqueflight question If the dipstick is the 1974 style there is an o-ring on the bottom where it inserts into the transmission unlike the push-in seals that they use today and I've had those o-rings get hard and leak. So the best fix for that is to get a new style seal and dipstick but unfortunately I don't know the part numbers for what you need but maybe someone else knows.