[jeffcoslacker]

As far as the brake light, it just sounds like the fluid lvel is at the threshold of tripping the light...the behavior you described is pretty typical of that, did you check it?

Watch your tach when you feel like the tranny is slipping, do you mean when cruising it feels like it's slipping, or when you try to pick up speed?

You could have something like a torque convertor lock jumping out of lock when it should be engaged if the rpm change is the same each time it happens.

Tell me more.