I recently got my th-350 rebuilt at a local tranny shop. It has less then 100 miles on it so far. when starting off slow in first gear it makes a slight chattering sound that sounds like a clutch chattering against the flywheel on a manual tranny car except a little quieter.. it also does it when it downshifts to 1rst like when slowing down to come to a stop.. is anything wrong or is it just something that needs to be broken in? its under warranty so i wanna make sure its perfect while it wont cost me anything to have it fixed...