Well fairly new 1997 fj80 to me. So when i bought the truck the previous owner said the tranny chattered sometimes when i was put in reverse. I call it SLIPPING. It seems like sometimes when under load it slips only in reverse. So either when its put in reverse and try to back it up a hill or when i have a trailer attached to it.. The Fluids were flushed recently and they are at appropriate levels. I hate the thought that i possibly need to replace the tranny and not ready to dump 3k into the tranny cus i still haven't paid off the truck first. If its an internal prob anyone got any clues on what it is???? Thanks