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727 leak.

1966satellite

1966satellite

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I had the 727 transmission in my Plymouth rebuilt before installing it. It leaks transmission fluid from what I think is the rear servo arm pivot. I've tried to seal the area with RTV but with no luck. Has anyone else had this problem and how did you fix it? I really don't want to pull the transmission if I can fix it some other way.
Thanks.
 
Sure it's not the selector shaft seal ? Mine leaked after rebuild, fixed it with a seal kit from A&A trans
 
IF it’s the servo, jack up the rear, clean area real good,let dry, cover it with RTV sealer; should work.
 
If it's the selector shaft seal, easy fix with the transmission in the car.
 
Car Nut said:
If it's the selector shaft seal, easy fix with the transmission in the car.
Click to expand...
If it is the selector shaft seal, what was your procedure for replacing it? There is also a seal for the throttle kick down just above it. Just curious as mine is leaking from the selector seal. Did you have to lower the trans to gain more access or have to remove the valve body? Thanks.
 
moparlee said:
If it is the selector shaft seal, what was your procedure for replacing it? There is also a seal for the throttle kick down just above it. Just curious as mine is leaking from the selector seal. Did you have to lower the trans to gain more access or have to remove the valve body? Thanks.
Click to expand...
Trans stayed in the car, I just jacked up the car up, used a special tool from eBay that I got for less than $15.
Seal removal tool.jpg
Shifter seal.jpg
Step 1-1.jpg
Step 2.jpg
Step 3.jpg
Step 4.jpg
Step 5.jpg
 
Drop the pan, drop the valve body and rear linkage. replace the o ring. Reassemble and adjust band.
 
0C9FC46A-E0CB-40B8-A216-D814C88472D3.jpeg
You also have to remove the bolts for the tail shaft housing so you can rotate the housing , to slide out the shaft
 
Car Nut said:
Trans stayed in the car, I just jacked up the car up, used a special tool from eBay that I got for less than $15./QUOTE]
Perfect! Thanks for the information, the photos help a lot. On to fixing that annoying drip now.
Click to expand...
 
1966satellite said:
Can I do that without removing the transmission from the car?
Click to expand...
Yes

You just have to rotate the tail shaft until the pin clears that stop or tab

It’s not difficult , just a little time consuming

Watch the tail shaft housing gasket
 
I used a block of wood on the trans pan when I used the clamp to squeeze the seal in. Make sure the wood is long enough to fit the pan from one end to the other. This is so won’t dent the pan.

Good luck, mine took about 15 to 20 mine.
 
The O P is talking about the rear servo shaft in his initial post and replacing the o rings

However , why did it get switched to the selector shaft seal ?

Two totally different projects / seals / o rings

Anyways
 
Bee1971 said:
The O P is talking about the rear servo shaft in his initial post and replacing the o rings

However , why did it get switched to the selector shaft seal ?

Two totally different projects / seals / o rings

Anyways
Click to expand...

Thanks to all of you! I love how helpful the people on here are. I'll probably try to replace the o-rings on the rear servo shaft this week if I get the time.
 
Bee1971 said:
View attachment 614455 You also have to remove the bolts for the tail shaft housing so you can rotate the housing , to slide out the shaft
Click to expand...
Exactly where my A100/727 is leaking, must have dumped 2 quarts out on the floor over the winter storage.
Thank you; I'll be getting to it soon.
Who has the correct seal? NAPA?
 
Rear servo shaft is either one or two o - rings - Chances are you will either find the o - ring missing or rock hard and brittle

I always swing by my local transmission shop for seals and o - rings
 
Shaft will have one or two o - ring grooves

In reality you only have to slide it out far enough to get at the o - rings

AD90A1EA-DC09-4585-886C-5039018C9A15.jpeg
 
Bee1971 said:
View attachment 614455 You also have to remove the bolts for the tail shaft housing so you can rotate the housing , to slide out the shaft
Click to expand...
I had a local trans shop tell me that they just brake off the tab and put in new o-rings and then epoxy over the shaft.
Not going back there.
 
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