[Madkidd007]

I own a V8 trailblazer platform and let me add my input. I’m unsure if 04 has a TAC module, I know for a fact 05 and up doesn’t use a tac but a different throttle pedal than Fullsize trucks so if you can’t find a tac module then that’s why. The exhaust manifolds like stated are direct swap for our trucks. You’ll save about 80 lbs because the trailblazer has an LM4 which is an all aluminum version of the LM7. As mentioned the oil pan is a front sump so will need to be swapped but the kicker is the ac compressor bracket bolts to the oil pan also. So you’ll need this adapter or keep in mind LS3 Camaro accessories have the same spacing so maybe something to look into. Engine mounts/isolators on the trailblazer can be used if you make custom frame stands which will also help to keep the compressor in the stock lower position. The catalytic converters are in the Y-pipe so either plan on cutting the flanges off and building exhaust. LS plug wires rarely go bad and used originals are typically better than new aftermarkets. No reason to touch knock sensors or intake gaskets which are actually molded seals. And as easy as all the accessories are to get to if they’re not bad don’t spend the money. LS parts last a long time and a lot easier to replace in truck than SBC items