Ok here is what is going on. Just ran a 26ft travel trailer from Indiana to Montana. I was going into a pretty good head wind. Now on the way back with no trailer I get what is like a slip when the converter is locking up. Its not like a complete free spin and rev up its more like a chatter. Trans has 60k on it and has about 35k on fluid. I was going to change it this weekend. Fluid doew not really smell burned, it is a little bit on the brown instead of red side. If I am running 50mph and hit the throttle hard, but not hard enough to down shift or anything, I get what feels like chatter (almost like in a stick) and a slight rev up on the tach. Any help would be great. Karl