First time poster long time follower. This sit is great and has helped me a lot with issues I've had. Unfortunately I'm stuck with this most current issue. I have a 2004 F-150 FX4. Recently when driving, after about 2 miles the truck starts not responding when accelerating. I'll be at a stop sign and when I hit the gas the rpms with raise and then first gear will slam in. I'll let off the gas and slowly press the pedal again and it will continue to happen. Once out of first gear the truck runs fine. But when decelerating from 50 mph I can feel the gears shifting hard. Brought to 2 mechanics both said I need a new transmission. Any suggestions or anyone have this issue. Thanks, Jake