Re: aluminum case A-727 leaks

Great story and list of the leaky 6 points – maybe I will look at the kick-down lever first. I left the tranny in place when I had the engine rebuild, avoiding shift cables. But it would be nice to get the tranny clean on the outside too, if I decide to have all the seals done. I am thinking with a local guru shop like Pat Blais I would be foolish not to have them go thru the tranny.......

From: 1962to1965mopars@xxxxxxxxxxxxxxxx [mailto:1962to1965mopars@xxxxxxxxxxxxxxxx] On Behalf Of Bill Parker
Sent: Wednesday, May 24, 2017 4:47 AM
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Subject: Re: aluminum case A-727 leaks

It is 1968 and I'm a senior in high school. After unceremoniously crashing my '58 Savoy I trade the wreckage in to the local junkyard along with $75 additional for a '62 Belvedere 2 door sedan with a 318 poly and 727. First day I drove it to school, I come out at the end of the day to find a giant puddle of transmission fluid had spread out from under the car. You can imagine the embarrassment as my buddies razzed me over my leaking new car. I walked to a local garage for fluid to get home. There I crawled under to look for leaks, with the car still running and could find a thing. But the next morning there was another puddle. My embarrassment was compounded by arriving at school in my mom's Volkswagen. Eventually I figured out that the leak was at the lockdown shaft seal. My temporary fix was to put a small washer over the shaft onto the top of the seal, following that with a small spring under the lever. This spring pushed on the washer enough to squish it and it sealed well enough that I never changed this arrangement. It lasted until I changed to a 383 and its attendant trans in 1970.

On May 24, 2017, at 12:32 AM, Daniel Davids <ddavids@xxxxxxxxxx> wrote:

We recently took care of all the leaks on the pushbutton A727 in our 64 Dodge 880. (Thank god for a 2-post lift.)

We originally thought the majority of leakage was coming from the pan gasket, but this was not the case.

The seal on the kick-down lever turned out to be the major culprit. I’d say the filler tube o-ring was next worst.

Here’s the list of potential leak points — basically every location where there is a penetration, plus the pan.

Granted, later Torqueflites don’t have the shift and park cables, but they do have a shift lever penetration similar to the kick-down lever in design.

* Trans fluid filler tube O-ring

* Kick-down lever seal

* Shift cable O-rings

* Park cable O-rings

* Speedometer cable O-rings

* Pan gasket

Here are some useful tips:

Be sure to straighten the pan as best you can before reinstalling it. Not all the bolt holes have stiffening ribs stamped in between them, so pay particular attention to these locations. When you think you’ve got it nice and flat, go around again with a straight edge and straighten it some more. It is worth the extra effort. Don’t overtorque the bolts! This is what warps the pan and causes leaks in between bolts. Spec is only 10 or 12 ft-lbs. Check your service manual.

To check your work, put some indicator dye in the trans fluid and drive the car a few miles. Then use a UV flashlight to inspect for leaks. Any fluid that’s leaked out will glow a bright fluorescent green. Here are links to the dye and LED UV flashlight we bought on Amazon (all free shipping w/ Prime):

Interdynamics 374CS Certified A/C Pro Oil and Fuel Systems UV Dye

https://www.amazon.com/gp/product/B002M4G24U/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

$7.99

OxyLED OxyWild 51 LEDs Pet UV Urine Stain Detector Blacklight Flashlight

$9.99

https://www.amazon.com/gp/product/B00R18VQ5W/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Lastly, don’t forget to change your filter and fluid. I got tired of not finding ATF+4 in the parts stores these days, so I bought a gallon, also on Amazon:

Mopar Brand Automatic Transmission Fluid, 1 Gallon

$36.62

https://www.amazon.com/gp/product/B00HN4GTQK/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Dan Davids

Seattle

P.S. You can play CSI with the UV flashlight to check the carpet and floors in your house. This will no doubt be entertaining, especially if you have pets.

On May 23, 2017, at 8:13 PM, <62-65-mail-list-club@xxxxxxxxxxx> <62-65-mail-list-club@xxxxxxxxxxx> wrote:

Ricky asked "But seriously, how many seals are the in the aluminum case A-727?
My ’62 shifts fine, but drips – seriously thinking about taking it to Pat Blais just to replace all the seals if nothing
else......"

So maybe we can put together a list of common failure points on the PB 727 for leaks. Here are a couple to start:

* O-ring on the trans filler tube
* trans pan gasket

Others?

Thanks,
Gary H.

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