So what's a good shifting RPM for my 305? I been shifting at around 3000 rpm but it sounds like its screaming its lungs out. I recently hooked up a tach(hillbilly style) and have been reading my rpms. So far it seems 3k is the best to shift as it keeps from lugging the engine all the time because of the wide ratio tranny. Don't get me wrong...that thing begs to be lugged. But sometimes I like to Go. haha. I made a mistake of giving the throttle to a friend and next thing I new, I saw the tach at almost 5000 rpms.....needless to say he was booted out of the driver's seat in a heart beat.