let me start off by saying my trannys been slipping at about 5000 rms so ive been driving it easy lately and recently it started slipping at lower rpms. then this morning i headed to advanced auto and after 5 minutes of it shifting fine it starts slipping at like 3000 so i let off like i usually do to get the tranny to engage again and get back on it easy and it just kept slipping so i pulled over and put it in park then in drive and gave it some gas and it just revved up. it wont move in any gear. i checked my fluid level and its overfilled from putting too much lucas in without thinking about it and it was time for a oil and filter change too. so im basically wondering, what broke and is it easy to fix or should i just get a new tranny?