If the rear transmission seal is leaking, transmission fluid will seep from the back-end of the transmission, where the transmission mates with the driveshaft.  Transmission fluid leaking from the rear transmission seal tend to be very messy; the fluid ends up leaking all over the rotating driveshaft whick flings it all over the underneath of the chassis.

You'll need to remove the driveshaft from the transmission to access the rear seal.  The easiest way to do this is to remove the four bolts that secure the back end of the driveshaft to the rear differential.  Once the driveshaft drops from the rear, slide the splined front end out of the transmission.  You can then access the transmission rear seal.

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