2001 Dodge Caravan Leaking ATF after replacing drive axles

I just finished replacing both drive axles on my Grand Caravan (3.3 Flex) and am now losing transmission fluid at a pretty good rate from around both axles.

When I was removing the original axles, I pried them out without inserting a pry bar into the transmission opening, and was careful to support the whole axle as I removed it from the transmission, making sure to not drag the splines over the seals.

I inserted the new axles after putting a bead of multi-purpose grease around the sealing surface. I made sure the snap rings engaged, and then put everything back together and topped it off with ATF+4.

The next day I noticed some fluid under the car and kept an eye on it, hoping that I'd just overfilled the tranny (or some other innocuous thing that would just fix itself -- hope springs eternal) but after a short drive I parked and noted more leakage.

This morning the level was OK, but after driving about 20 miles, the level has dropped to the fill mark.

How should I go about troubleshooting and repairing this?

Thanks.