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Your vehicle has a speed sensor mounted on the transmission and sends a signal to the computer, which drives the speedometer in the dash. The speed sensor could cause a transmission issue, as well as ABS light to come on. I wouldn't think that replacing the speedometer could cause your current issues.
$98 labor and the clock spring from Ford runs about $150
The compressor clutch may be seized and driving the compressor all the time.
Not sure if you've already serviced your truck, but just wanted to share a few things. It's important to note that valve cover gaskets shrink with age and this could be a possible cause of the leak. Simply tightening the valve cover doesn't solve the shrinking problem. (As with all repairs, unless it's looked at, it's difficult to quickly 'diagnose'.) If your gasket hasn't shrank, tightening the bolts *may* help. Generally, the gasket is a very inexpensive part and the labor to replace can be minimal. You're better-off simply replacing it to avoid any future leaking.
Most common cause is Exhaust Gas Recirculation (EGR) Vacuum Solenoid Valve (VSV) . Very common. This part will most likely be Toyota only.
Does your model have the tray in the console? If so it looks like plastic fasteners hold it in place. Just pull straight up and the retainers should come out with the console tray.
Problem could be either the HVAC control head in dash, or the HVAC module.
Check the brake light switch. It may just be a coincidence but if it isn't adjusted properly the brake lights could stay on. There is a rubber bumper on the brake pedal arm that the switch contacts and it will wear out over time, throwing the switch adjustment out of wack.
If the idle speed is too low, try cleaning the throttle body good and Idle air control motor.
have brake pads been contaminated with grease or brake fluid? That will cause it. Also make sure the shoes are installed properly, long and short shoe orientation.