untill now, I have had the fans and harness in my car waiting to be installed, but i havent actually gone and checked (its dark and raining outside) But i think i have the 34" radiatior (with the lq4 6.0) if thats the case will the ls1/lt1 fans still be sufficient?

 

I just did the efans on my 03 Yukon Denali. I used the 05 and up fans from the full size trucks and they work awesome.....I believe there dual 15's. The LS1 fans are smaller and don't move as much air so I think you may be better off getting the 05 fans. They bolt right in (2 bolts) and look factory. If you want, PM me and I can take some pics of mine for you to give you an idea.

 

ya i already have the ls1 fans, and ya now that i look at it my radiator is definitely bigger umm i guess i will just try the ls1 fans and if their not enough then i will do the 05 efans

 

You can sell the LS1 fans on here in 5 seconds.

 

i already bought the harness too, so they definitely wont work on my 34" radiator? DAMMMN

 

They will work but I don't think they'll be enough. If you got the harness from Nelson, it should be as easy as swapping out the connectors for the ls1 fans to the 05 e-fan connectors. I got my harness from Nelson and the wiring for the 05 fans and ls1 fans are exactly the same. I would go with the 05 fans just for piece of mind.....they can be had brand new for $265 shipped.....you should be able to get half that for your ls1 fans on here in a day.