Loosing trans oil approx 1 pint every month.

[cutlass supreme FE3]

I have a 1988 Cutlass Supreme International (130,000 kilometers) with an autobox with OD and noticed that the tranny fluid goes low every month. I need to add about 1 pint to get it back up to full hot marks but there is not much leaking on the pavement when parked. Maybe a few drips. I had the input CV shaft replaced on both sides and the gasket for cover on the side of the transmission.
I would assume loosing like a pint a month it would surely show up on the pavement when parked but now puzzled??

[gpse3400]

just have to follow te greas stains. But I'm willin g to belive that it the axel seals since you didnt say you have replaced them.

[cutlass supreme FE3]

just have to follow te greas stains. But I'm willin g to belive that it the axel seals since you didnt say you have replaced them.

axle seals replaced both sides.

[IsaacHayes]

Is there trans fluid in your coolant? The inside of the radiator could have a busted trans cooler. Happened to me.

[cutlass supreme FE3]

Is there trans fluid in your coolant? The inside of the radiator could have a busted trans cooler. Happened to me.

no trans fluid in the radiator.

[RedogOnyx]

Anything on the undercarrage of the car?

My Delta's TH400 was leaking from the pan, but blowing back all over the bottom of the car

[cutlass supreme FE3]

Anything on the undercarrage of the car?

My Delta's TH400 was leaking from the pan, but blowing back all over the bottom of the car

not leaking at the pan.
i replaced the pan gasket when i drained it and replaced the filter too at 120K

[IsaacHayes]

Well if it's not leaking outside the trans, or from the trans cooler, then it must be leaking through the modulator.

Pull the vacuum tube off the modulator and see if trans fluid pours out. It could be bad and the engine just sucking the trans fluid up and burning it. If so now would be a good time for an adjustable pioneer one. (or regardless if you're down there)

[gpse3400]

Second that

[cutlass supreme FE3]

where is the modulator??

[gpse3400]

On the front of the transmission you'll see a canister with a steel vaccum line attached to iy. thats it right there. It has a fork holding it in with one bolt. Look near the electrical connector on the transmission.You'll have to possibly remove the intake air box to get a better look at it.

[cutlass supreme FE3]

i have examined underneath at the cv input shafts and notice a bit of oil sweat but these were replaced recently. So I pulled and pushed the shaft up and down and there is a bit of play. Then I took a prybar and tried to pry it up and down and then some oil seeped out.
What are my chances that the differential bearing are shot?
I'm guessing that when driving and going off hard bumps that the oil is leaking and when it is stopped nothing leaks.
anyone had this type of problem or issue before?

[cutlass supreme FE3]

On the front of the transmission you'll see a canister with a steel vaccum line attached to iy. thats it right there. It has a fork holding it in with one bolt. Look near the electrical connector on the transmission.You'll have to possibly remove the intake air box to get a better look at it.

is this the modulator??

[bszopi]

Yes.

[cutlass supreme FE3]

Yes.

thanks
so getting an adjustable one would have what kind of advantages?

i was leaning in just getting an OEM replacement.