Knock sensor location

Truck could be running hotter than normal and also check the EGR valve if its opening-that can cause detonation/pinging

Knock Sensor (2.3L) On left side of engine.
Knock Sensor (4.0L) On top center of engine.

The manual doesn't list one for the 2.5L..

not running hot and can not fin knock sensor,on left side of motor.

I have an 2001 ford dealership shop manual and it shows that the 2.3 and 2.5 rangers with knock sensors only...

not running hot, but heater bogs down motor, and cant find knock sensor the left side of motor auto zone shows knock sensor for 2.3l, but not for 2.5l.but it is pinging when shifting gears tryed better gas still did not help.

Sorry.... it shows only the 2.3 and 4.0 have knock sensor

When is it pinging? after the shift when engine is under more load? Or at the higher RPM's before actually going into next gear? A lean condition can cause this as well, go simple and check the fuel filter if it hasnt been done yet