Guess it's my day in the barrel. I changed the giant stock muffler out for a Magnaflow. The increased sound allowed me to notice a weird shift in the tranny It's nothing that can be felt...no slam, no slip. When the 3-4 shift happens, it drops into fourth smoothly enough, then a few beats later it drops another 300rpm or so...essentially feels (or acts) like a 4speed OD transmission. I've gained an extra half gear! The good news is, I am an O.O.,so Isuzu is married to me for the entire ten years(HA) and all maintainence has been overdone. Plus my Isuzu dealer is only 27 miles away. I just turned 30,000 so service is due anyway. I run Mobil1 everywhere, so that's not the problem(yes it's full) We'll see. (encourage me to do the Tropper stick transplant...keep everything, but gain a third pedal) I just HATE anyone else touching my car...ever...a real problem for me, but a warranty is a warranty. Won't kill me to play by someone else's rules...I guess. Love, Wayne