I got a good look at the transmission when I had the car up for the brake job today. The cooler lines were dry and a couple of pan bolts had ATF on them, so the gasket might be starting to go. There was also fluid at the bell housing.

I dried everything off, took it for a short drive, then parked it for several hours. To my dismay, the only spot where there was ATF was right below the torque converter which leads me to believe that the front seal is going. I'll use some Trans X and hope that it swells that seal a little bit. I'll also make sure to park the car on an incline in the driveway since it doesn't seem to leak that much in that position.

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'81 300SD