loud knocking noise

[teamp]

I have a 1998 4x4 4.0 manual tranny ranger that make a loud knocking noise(almost sounds like a deisel). Dont know if noise is coming from tranny or motor. Any suggestions

 

[el_conquistador]

Is it in gear or just idling?

 

[teamp]

both

 

[kduckett]

My rod bearings were shot due to oil starvation, my truck made a diesel like sound that was loudest in the engine oil sump. The engine was aslo louder when cold and got only slightly quieter when it warmed up. I replaced my engine and checked my old engines rods, they all had quite a bit of radial and axial play at the crank. FYI I drove about 50,000 miles on bad rod bearings - gotta love these german engines, they will do anything.
P.S. mine was a "fast" diesel like Knock as each rod was impacting the journals on every stroke, I hope this helps you.