I own a 2000 chevy silverado ext.cab, I am in the process of modifing a 2002 6.0 (LQ9) and tranny(4L80E) Boring block to 408 C.I. replacing crank with a 4340 forged steel crank, Installing forged pistones, replacing rods, going with stage 2 LS1 heads, and LSX manifold, trying to achieve 450HP +. and installing that into my 2000 Silverado ext cab. I am planning on swapping over the 6.0 pcm as well, does anyone know will I have to change out the complete wiring harness with the 2002 harness or will my 2000 harness work with the 6.0 pcm? Thanks for any info that you can give.

 

should all work just fine

 

Spertech will know what you need to do to get the trans to plug and play.Engines fine.What kind of $s is going into that 408?

 

Yeah give Speartech a call!

 

Thanks for the info, Gonzo, I will give Spertech a call, do u know there ph#. I am planning on spending around $8000, I have a company that builds race car engines here in north Georgia, doing the work for me. Btw, what did u have before the 6.0? and how did your swap go?

 

Thanks TigerFan, I will. Btw. how do those 410 runnin gears work for you in your truck, what were you runnin before?

 

Thanks, thats what I am hopeing for

 

What you want to do is easy,all the info is here,just use the search

 

Gonzo, I am new to this site, but I am finding what you said is true, all the info. is here, I e mailed Speartech about my wiring concerns, so will see what they say, Thanks again.........

 

No problem 6.0! My best run with the 3.42's was 16.4 and that was in 90 degree weather with around 65% humidity(its bad in Louisiana and Texas!!) Two days after I got the 4.10's(and remember Im still peg leg and not having traction problems) and my best run was a 16.0 and the weather was basiclly exactly the same! I've been hitting 16.1's more than anything but weather is a dog here but Im reallly happy with my time vs. the mods I've done! The track gains were sweet but driving on the street is a blast!!!!!!!!!!!!!!!!!!!!!!!!!