I got me a 06 F150 4.6 automatictransmission a few months ago. I noticed a few problems that might be related. Any info would be great.
• it marks 5mph faster on the dash then it really runs.
​​​​​​•has high rpm when driving over 55mph. Have a fealing 5th gear is not engaging because the truck slows quick to 50mph when gas is released.
•slow down shift at stops. Cant do "rolling stops". The truck stays in a uper gears for several yards before power kicks in. To avoid, need to stop wiat count to 3 them go. Ps i live out in the country.
​​​​​​•Truck dies when going from reverse to drive especially if turning the steering wheel. Doesn't shake or nothin... just dies. To avoid, i need to give it gas as i switch.
• red break light flickers on dash. Has new pads. Fluid is good.

Note. Transmission oil lvl is good.

 

5th gear? Do you mean overdrive is not engaging? You probably do have that gear engaging because since it's only 4 gears, 55 mph will have you at high rpms since you have no more gears to go through. Maybe your clutch or torque converter is going out? First though, clean your throttle body. It might very well be the idle control valve sticking or the TPS going bad since both work together to give compensate to give the engine air as you bog it down by shifting it into reverse. If it's going bad or sticking, it isn't getting enough air when going into reverse. Check for any codes from the OBDII as well. And if THOSE are good, it could be a wire being shorted that connects the TPS and ICV.