cavalierchristian

Hello, new here, used the search, ran through a few pages and nothing. I have a 99' grand cherokee, and when i get on the gas pretty hard (over 3 grand in first and dropping rpm the higher the gear goes). i can hear it to LOUD not sure of where the noise is coming from it is so loud. Where should I look to check WHATEVER gear is slipping and maybe some info on how to change it if you don't mind?..