1995 dodge 1500 with a 5.9 engine. I can't get the fan clutch nut off. Does anyone know if this vehicle used reverse threads??

Hammer and long punch. Put the punch on the edge of a flat on the the nut and hit it toward the pssenger side. One hard quick hit aught to do it.

I understand all gas engines are standard thread. Some Cummins may be left hand.

I just did an '06 Durango. It was a bear. My usual method - hit the wrench with a hammer didn't work. I tried the punch method except with an air impact hammer. Didn't work. I finally made a pulley holding tool - steel strip from the arm of a retired garage door opener with 2 studs to engage the holes in the pulley. With a long handle on the holding tool and a cheater on the wrench I got it.

They are right as said.Ive removed hundreds.I use my air chisel with a long chisel.Just bump it on the flats and when they come loose they spin off.When I install them just spin it on and a bump with the chisel tightens them.You need a chises on the air hammer.Just get a flat where it easy to get to and move the fan blade till you can get to it.This should be put in the archives as its asked probally 5 times a week.All left hand threads have a sticker or its embossed on the shroud.Rocky

Just did my 01 Ram.. what a nightmare..
I own a wrench nig enough, but it would not come loose, I finally resorted to the air chisel method and it came loose..
BUT,
when I went to install the new one, it screwed on easily about 5 turns and locked up...
Dont know if the pump shaft was nicked from the air chisel or the threads in the new clutch were bad...
Anyway,
I had to borrow the proper wrenchs from a dealer mechanic to finish tighting it up..
One has two pins to go into the water pump pulley, the other wrench the nut wrench..