water pump question

[smokin150]

real quick, cant seem to find what im looking for with the search feature, anyone know what the thread size and pitch is for the water pumps on our old trucks, might have an electric fan and clutch asm that might just work, cant recall the thread pitch and all tho. Thanks guys.

 

[BDCarrillo]

The pulley on the water pump, or big goofy reverse threaded nut on the fan clutch?

But if you have an e-fan, no need for a clutch or to engage the pulley...

 

[smokin150]

The pulley on the water pump, or big goofy reverse threaded nut on the fan clutch?

But if you have an e-fan, no need for a clutch or to engage the pulley...

I'm talking about the big goofy reverse threaded nut on the fan clutch. I currently have the viscous fan clutch setup, don't really want to go to an e-fan setup. I know there has been a lot of discussion on the horton electromagnetic fan clutches for the PS trucks and i know they wont work with our setup without some major mods, however I might have a solution to that but i cant remember the size/thread pitch of that big a@# nut that holds the fan clutch on.

 

[cpdenton]

1.25-18. Left hand.