it is true that if you burn out too much with the 4T60E trans or the 4T65E trans that you can blow up the differential. i know this for a fact because i ended up doing that in my old car which had the 4T60E trans. then i got my 02 GP GT. my father works at a tranny shop for a living, he has specialized in transmissions for years. once i got my 02 he called me down and showed me what happens when you burn out too much, and it can possibly only take one time. someone brought an 03 GP GT in for service, my dad pulled apart the transmission already knowing the problem and showed them and myself what happened. so people shouldn't deny the fact that it happens quite often just because it hasn't happened to them. the same thing happens with monte carlos and impalas as well. i've seen this stuff first hand, not to mention, my buddy with the same car i have just blew his up a month ago. these cars are not meant for the abuse unless you have the GTP, the GTP is the performance model.