Quote Originally Posted by mike5.3 View Post
Same question Ive had for a little while now. I have a 05 with the 4.3, going to 5.3 from a 01-02, i guess I will buy the harness and pcm.

why dosent the pcm not play well? thats all you keep saying sleeper. what does it do and why wont the 02 engine, harness, and computer work in a 05?

the engine ( block & heads dont matter ) its the intake that'll make a difference, if you have a 99-02 then you want a v8 99-02 harness and computer, the engine doesnt matter but you'll need a v8 99-02 intake and throttle body, vice versa for a 03+ you'll need a v8 harness of your year model, if youre dbw then stay dbw, makes it easier, same as 99-02 if youre dbc then stay brive cable, basically you wanna keep the same year harness of the truck but using a v8

i run a 05 engine in my rcsb thats a 01 model

on a side note the 02 computer seems to be a better choice in computers to use, then though i yet to find anything difference as performance thats whats said, i know the 99 models have 2 VE tables but i have written a 02 OS creating 1 VE table and it still performed perfectly