I have a trans leak making me nutso. I keep thinking I know where the leak is but after new parts in the spot (speedo cable output, dipstick, rear band apply shaft) It still leaks. I run the trans through the gears while driving the car till hot and then top up to the hot mark on the dip stick with the engine idling in neutral. The fluid level is fine till the car sits.

Here's the questions - After sitting a few days to a week the fluid level on the stick goes way up. I've assumed it's due to converter drain back because after driving the car the level on the stick goes back to were it was when I topped it off originally.

So is converter drain back normal on a A-727? I don't know the year of the trans, but it's the common cable shift type from the 60's/70's cars and trucks.

And

Is it impossible to not have a leak when the fluid level gets above the top of the pan after the converter drain back? The Mopar I had before this one seemed to have the same converter drain back but didn't leak.

I'm stumped.

There is a anti dran back check valve for the converter on the top of the valve body, it probally has some debris holding it open. I never run my 727 tranny full, especially with a deep pan, I run them at the add line when hot

finally stopped my leak by changing the dip stick seal to the newer style.

ours is the o-ring type and the newer 90's type is a big gasket.

I was able to graft a newer end onto my old dipstick.

it doesnt look like it could leak, but it clearly was.

There is no converter drainback valve in a TF, drainback is perfectly normal and a well-sealed trans should contain the increased fluid level.

Normal fluid level is well above the pan and up into the dipstick tube.

I think he means they don't come from the factory that way.

Kevin

I had one stick closed on a maual shift valve body from debris, that flooded the 8 inch race converter and wouldn't let is foot stall properly.

How do you flood a torque converter that is already filled with fluid?, I have seen them balloon up from to much line pressure but I have never heard of this.