My transmission is making this hissing sound when i rev up the motor on a 2004 Ford Explorer eddie bauer edition

If you don't have a visable leak it could be the front pump. Are you sure its coming from the transmission and not an engine pulley? Alex

Anytime you have a strange noise coming from your vehicle you should have an ASE certified technician look at it. We can look at it ASAP. When would you like to stop by?