hi,welcome to the forum...some of these camed guys will chime in on your question but what will help you alot is a custom hot tuned pcm from farmtruk.delete all your torque mgmt and increase your mpg with plenty of xtra power you have been messing...look in the forum and you will find where the guys were talking bout the 05 rad fans for their trucks...lots of good info here
'13 silverado LT...stock
'11 lt 4x4 z71..tvs1900
'01 gmc twins 6.0 jakes 400 ladder bars w/ coilovers tuned by nelson performance