Technical Dynaflow expert needed

I have a front seal leaking issue with the Dynaflow in My 1954 Buick Century. When I first got the car, I knew it had a front pump seal out. I replaced the seal, and it is still leaking from same area. I had it idling yesterday when adding fluid, and it appeared to be about an inch and a half or so above the full mark. (with it warmed up) Would this cause it to leak from the front seal? I put it all back together per My '54 shop manual, and everything was clean during re***embly. What is the problem, would being a quart overfull cause this??

 

It could. I suspect that the case is vented somewhere, but couldn't begin to guess exactly where. It could vent into the bellhousing area I suppose, or somewhere else near the front of the transmission. There could be a vent tube on the top of the case as well.

 

I drained about a quart and a half from it, and it was still dripping. It has a breather vent in the rear side of the case. I'm beginning to wonder, if the front pump pressure regulator valve in the valve body may be sticking, the car sat in a barn for 39 years. The new front seal should have sealed the original leak

 

Operative word: should.

Was the sealing surface on the hub of the fluid coupling perfectly smooth? No noticeable pitting or surface wear on the hub where the seal rides? Did you check to make sure that the garter spring was in place on the back side of the seal lip, or there at all? Stranger things have happened...

 

Yes, the spring was in place on the back side of the seal lip. The hub coupling surfaces perfectly smooth. Seems like it is building too much pressure and forcing past the seal

 

Did you verify the vent is not plugged?

 

I stuck a small screwdriver up as far into the tube as it would go, did not see any obstruction

 

Seal in the correct way?

 

Oh yes, it is in correctly

 

Get a factory manual for your car, they make reprints. Best money you will ever spend! There is a dynaflow section with complete instructions on what to check, what the pressures should be and how to check them.

 

I already have an original one, read the Dynaflow section several times and it shows the pressures... I do not have the gauges and stuff that is required to test. I'm still thinking something is sticking from sitting 39 years. Pulling the pan to check things

 

Got pan off after 45 min of digging 30+ years of caked on dirt from around the bolts. I did see some dirt particles that could have fallen in when I was removing the transmission. I'll check the pressure regulator valve and make sure things are dirt free before putting pan back on

 

An old time trans guy told me it is usually a waste of time replacing a leaky front seal because if the pump is worn it will just start leaking again.

 

I can't imagine pump being worn out at 60k miles. Car hasn't been on the road since 1977

 

Pose your question on Buickclub.org under the post war forum. Lots of knowledge and people willing to provide advice.