Can the wiring harnesses from the 02' 5.3L trucks be used on a 6.0L? I have a 02 Lq4 and i found an engine wiring harness, dash harness and guages for 100.00. Can i use that harness or do i have to find a 6.0l specific harness? Also what ecm do i need? I have never done an ls1 swap before and i got a good deal on a lq4. I know its not the HO lq9 but its a start. I can always upgrade to better heads and cam later on, or maybe just a turbo. I am swaping this into my 91' rcsb and i was going to use the newer model guages and build a custom dash for it. For those of you wondering why im getting a dash harness and guages too. I hate my 85 MPH speedometer. Will an AC delco mu146 fuel pump work for the swap? Does anyone have any sugestions about how to get away without notching my frame for the a/c? Are the S&P brackets the only way to go? I still dont have the accessories just yet. I have an 85mm Getrag 5 speed transmission with the external slave. Can i bolt my 5 speed transmission to the new engine and use it till i blow it up or do i need a gen III specific transmission. I was going to do a t-56 swap later when i get more money saved. If anyone can help me it would be greatly appreciated