Transmission Fluid Coming Out Of Vent ???

Looking for some advice before I start pulling things apart. I have a 70 Hemi Roadrunner all pretty much stock. I bought the car and left it sitting in storage for 2-3 years. The last couple of times I have had the car out, it will start pushing transmission fluid out of the bellhousing area. I do not believe it is coming out of the front pump seal. It also seems the warmer it is outside,the sooner this starts to happen. The car has the stock 3 core radiator,looks to be in good condition,stock converter and the stock transmission cooler.
Am I fighting a overheating problem in the trans, and if so should I be looking for a fluid flow problem or internal transmission troubles. The transmission shifts firm and the fluid is clean and red.
What kind of tempature should I see if I take a reading at the trans pan, 200-250?

Thanks!
Dan

Assume you checked to make sure it is not over filled? 250 is in the ball park on the temp.

the trans temp should be close to engine temps.
250 is on the high side and cheap fluid can foam up causing it to leak out the vent.
you may not want an aftermarket cooler on that car but i would recommend it,even if it isn't the cause of the leak a cooler trans will live longer and perform better.

hi i had same problem fond it to level to hi worng dip stick remove a quart at time till stoped coming out of bellhousing to prove i was on the right trace

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Assume you checked to make sure it is not over filled? 250 is in the ball park on the temp.

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I have checked, it is not over filled.

Thanks!
Dan