When I start the truck and put it in drive it take's off really good and fast and the gears change ok but after you slowdown and come to a stop and you start to give it gas it feels like you are pulling something very heavy and it's sluggish and after a while it starts to leak transmission fluids some time's from the front and now from the transfercase, I already change the transmission and it doe's the same thing can someone tell me whats wrong. Thank You