There are only 2-3 fan clutches for all the apps between a 4.3 V6 and an 8100 or diesel 3500. The GM pump at the dealer is $300 retail so you might wanna go aftermarket. Be advised the parts store pumps don't have a tstat, seal, or housing (may be OK for you) like the GM pump does. GFZ is most common amoung all the clutches and most common to fail 03-04. Jeff is correct, we have no idea what you are working on.



Then again I made a long post about your issues earlier today and I do not see it.