727 Torqueflight question

[Kevin Panzino]

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]

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]

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

[e vassar]

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]

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]

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.

[Cotten]

Also look at the neutral safety switch, on drivers side above pan rail. They get old and crack and leak down onto pan rail. It looks like its the pan gasket leaking.

[GTX JOHN]

Most common leak and most difficult to find is dipstick tube.
The new ones are a way better sealing arraignment. But a new O ring from
the hardware store and making sure it is not bent up will usually save
the day!

[theman440]

More than likely the culprit is the selector shaft seal.

[Kevin Panzino]

Thanks guys. Gonna get it up on the lift and take a closer look.