you know it could be my trans, i've only experienced a transmission slipping once and it wasn't my car, it was like the car would pop out of gear and go back in. My truck doesn't act like that, but it does lose a good amount of speed going up hills unless I really get on the pedal and most times when I do get on the petal the transmission doesn't kick down like it should. Otherwise the transmission shifts fine it doesn't shift hard and still shifts through all the gears fine. When I first got the truck 2,000 miles ago I changed out the transmission fluid it was pretty nasty but didn't smell burnt. I ended up changing the pan twice so I ended up putting 8qts total in the truck and now the fluid is nice and red and doesn't smell burnt. Does this sound like a trans on it's way out?