my tranny seems to be slipping with 109,000 on it, like when you romp on it, it'll go to 4000 rpmand sit there for like a couple of seconds then jump to 4500rpm then shift and goin up hill sometimes out of no where it'll stay at the sam rpm but drop in speed fast then grab and go back to the speed it was at, and it seems to be making a a chattering noise when your sitting there in any low gear, What could this be, Thanks Addy