A transmission fluid leak may be noted from the area of the 13 pin electrical connector. Replacing the guide bushing and o-ring seal should correct this issue.Google+
Car Problem Reports
Dodge Sprinter 3500 Transmission Fluid Leak
Dodge Sprinter 3500 Problem
Average Mileage: 77,807 mi (72,000 mi - 83,614 mi)
Visitor, 2006 Dodge Sprinter 3500, 72,000 mi
Just bought the sprinter ... stopped at light after driving only 50 miles. Vehicle would not move from stop light. After a few attempts to drive. I also tested reverse ect. Would not move. Pushed off road. Crawled under truck and seen moisture around right front of trans. I could see it looked like around bushing for electric connection. Reading on internet ... changed bushing. Then; after test driving around town. Same type of problem. Still has small leak. Now it looks like it may be O ring on the connector plug. Taking it apart again.
Visitor, 2005 Dodge Sprinter 3500, 83,614 mi
Leaking ATF from connector area.