I've got a 1991 Silverado with the 350 and 700R4 with 321,000 miles on the chassis, and about 20,000 on most of the powertrain. Problem is i was letting my parents use it and when the were it decided the fan didnt like were it was on the water pump.. SO it tore up the shroud, the fan, the radiator and the water pump.. I was kinda wondering if anyone knew if a later model 2001-2006 radiator would fit in there with minimal modification? I am looking to go to electric fans since my 2006 has this and i notice the power difference over my last 2002 5.3.. I know i wont see a huge difference but a couple of ponies never hurt. Also any ideas on upgrading the Water pump (the fan wallowed out the bearings and not to sure what else yet) Since this is a fishing truck and more or less a beater i was planning on a 2003-2006 radiator with the electric cooling fans from a junk yard... What do you all think??