Is it worth the upgrade and if so what's the best/easiest route to go to install some? Mine has a 4.8 but I'm planning to build and install a slightly cammed 5.3 in the future. TIA

 

Ls1 fans and a nelson harness, or make your own

 

Anyone ever use this?
http://www.ebay.com/itm/Electric-Cooling-Fan-Harness-Switch-Kit-GM-LS1-LS7-LS9-Engines-/151641156629?hash=item234e846c15&vxp=mtr

 

I used the PCM of NC kit with a set of hand me down LS1 fans. Nice kit, easy install.

 

My opinion: NO. Keep the clutch fan. No noticeable difference in power, response, anything and you lose reliability switching to electric fans.

 

Reliability? Ill tell ya whats not reliable is the darn fan clutch! I replaced at least 5 of them the first ten yrs I owned my truck. Swapped to "BeCool" fans and a good harness ran thru the computer and have not had an issue the last 3 yrs.. Not to mention you now have two fans and the chances of both going out are slim to non! Although the gas savings is minimal, there still a slight gain in mileage and no drain on the motor which has to be worth something.. I say go with the fans. The way it should have came from the factory to begin with!

 

I also did the efan swap. I just bought a 34" core radiator like from the newer trucks equipped with efans and then bought the e fans from ebay that go with the newer models. All in all i had about $400 tied up in it and it totally chenges the way your engine compartment looks, it cleans it up a lot. This isnt one of those modes where you will pick up 20 hp and 3 mpg but it is one one of those mods that adds to the overall package. Its a good supporting mod to do along with other things. I also used the blackbear efan harness

 

Is there any pcm tuning needed? Thinking bout doing this also

 

If you are lucky you might be able to find an 05-06 truck in the junkyard. I was able to get the fans and the factory fan relay for <$100 which is wayyyy cheaper and factory than those flexalite fans. Assuming that you have the 34" radiator (get it with the fans) and a blackbear tune (efan tune only is $55) in that might cost more.

 

I called Just Chevy Trucks today and ordered some fans and relays for $360 smthn and ordered the cheapest 34" core radiator off ebay for like $86... my clutch fan has lasted 15 years but my radiator has a crack from a deer I hit and my tranny is pulled right now so ima upgrade while im down