Technical Buick 1950 Dynaflow leaking

Ok i know this isn´t unique, it´s more like a fact, if a Dynaflow doesn´t leak it´s probably empty.
But i have noticed over the years that it leaks the most when parked for a period of time, here in sweden the car sits for 6 winter months and during that time it leaks more than during driving season, this spring i had to fill up with 3 quarts.
After driving a summerday and park it for a couple of hours i can se a couple of drips under the trans, some of the leak is from the torqueball but i doesen´t leaks that bad i think,.
Anyone else noticing this problem or better, anyone got an idea what could be the cause
I´m thinking, when the car is parked over time and the oil is not pumped around, the oil leaks somewhere internal and starts to build up a level to a point it starts to dump it to the floor.

 

Not familiar with the Dyna but most 50’s automatics “torque converter” or what ever it was called back then leaks back into the transmission body. Mine does it weekly and fills the Governor in the tail shaft housing. I need to fast idle a minute to pump it back up prior to moving it even at a week but used daily no problems. I’m guessing this may be your problem also.

 

The Dynaflow does actually have real torque converters, unlike the Hydra-Matic.

However, the Dynaflow oil pan is small and the primary torus large. Your drain down statement is quite likely it. The most likely scenario being it drains down, overfills the pan and leaks from the tailshaft seal.

Phil

 

You are so right about them leaking. I have seen them leak into the torque tube.

 

I ***ume the car is in storage during the winter? Can you support the rear wheels on stands and run it once a month?
That would keep the fluid distributed plus lubricate the rear axle and keep the engine seals wet.

 

Thanks for the comments.
When I bought the car the whole rear axle were filled with ATF resulting atf in the brakedrums, and I know the atf are a rearaxle killer so I rebuilt it with new seals but I can still se some leakage over to the axle, so i change the axle oil every other year.

 

I store it in a non heated garage so that is not possible, but it would probably be the best solution.
I se you live in Virginia, my Buick is imported from virginia in 2012

 

When you rebuilt the rear axle, that would have been a good time to put in a torque ball seal kit. I ***ume the straight 8 is still in?

 

Yes the straight eight is still there.
Change the axle shaft seal were the first thing i did when I got it home, now 10 years later i have learned a lot more about Buicks, if I hade done it today I hade ofcourse changed the torque ball seal too.
Had only worked with chevys before and hade never seen someting like that before

 

My cad has a mid sixties turbo 400 and when it sits long times will leak too...

I figured it was just marking it's spot.

 

My problem seems to be "normal"

 

Its leaking because torque convertor drains itself in transmission.
And because transmission seals dont hold, those that are normally abowe oil level.
Overhauling with new seals should do the trick.

Years ago i repaired cast iron powerglide, and its not leaking a one drop during normal winter season, but whennit sit over year, it will leave a huge oil stamp under it.you just cant make every old part like new anymore.
You might try small dose of red line seal saver.

 

Years ago, I had a 54 Buick that the rear seal leaked. Given the torque tube drive shaft the fluid leaked back into the rear end and eventually the rear end overheated, and I had to replace the rear end. I would check this.