Replacing water pump on 84 C10 w/ 4.1L

[rhlanham]

My son's truck is leaking antifreeze, and while I haven't had a chance yet to see where it is coming from, I suspect it is the water pump since it is either the original (truck has 147k miles) or at least very old. Anyway, is it very difficult to replace? I've replaced others, but not on this vehicle yet. Any surprises I should look out for? I think I will go ahead and replace the thermostat too, as they are pretty cheap. Thanks for any help. This site is a wealth of information, although it seems that most of you with early 80's C10's have different engines in them. Oh well!