Where is the noise coming from? If its from the fenders or wheels is a much different problem than if its coming from the transaxle.
There is no way for me to know what is knocking in your Dodge Ram.There is no way for me to know what is knocking in your Dodge Ram.
rack and pinion
An expert would have to hear the sound for a diagnosis. It may be your main bearings are knocking. If it also happens if you lift your foot sharply OFF the accelarator, then that's a sure thing. - Only way to check for sure is to fit an oil pressure gauge.
probably a wheel bearing
knocking noise
It should not. A U-Joint that is worn will make a knocking sound when it starts or reverses.
Low fluid level.
Most likely the power steering belt is old and should be replaced.
One or both of you're drive axle bearings is dry
NO. A knocking noise in the engine is a problem in the engine.
I get knocking & ping noise coming from the fuel injectors
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.