03 sierra 4.3 to 5.3 swap(i need help)

[lowslung85]

I'm going to tell you this now i'm in the process of doing a v6 - v8 swap in my 04 and its damn near impossible to try and make a 99-02 harness fit an 03+ truck and its more trouble than its worth to try and keep the cable driven throttle body. I tried and tried everything I could possibly think of to make this work and it just isn't worth it. Get yourself a harness from an 03+ truck and the drive by wire stuff and save yourself the headache trust me. The pin outs for the 99-02 harness are different from the 03+ so they do not work when you plug in the 99-02 pcm my truck did all kinds of weird stuff because nothing is pinned right in the wiring harness compared to the 03+ in the truck already.

Just do as he says lol, we have already went through this on his truck, harness,dbw tb,tac module, and pedal ur best bet is to pull it from a salvage yard and dont forget the harness from the pedal to the tac module. Btw putting the pedal in sucks.

[sonnychills]

Hahaha yeah I pulled the harness today, took some pics will post later and I can see why it won't work. Oh well now I know, hope to look for the dbw stuff tomorrow

[sonnychills]

ok in this pic is the motor side of my 99-02 harness the screws into the fuse box

this is a pic of my actual fuse box...

notice the difference? looks like about half of what should be there is...
so i pulled the harnes today and im shipping it back to the guy i got it from. he said he has a 03+ harness that he will trade me (since i paid 150 for this one) and hopefully the guy he had tune me ecu for cable will just swap this ecu for another.... if not im going with nelson or a guy my buddy knows around here. priced out the pedal, harness, tac module, and dbw throttle today ( about 200 bucks). i really hope to have it running by november cause im going to a show to benifit breast canser. my mom is going with me and she has stage 4, so i really need to get this going so she can roll up in something thats gonna be in the show. if i missed anything please chime in....

[Frenchy]

Just do as he says lol, we have already went through this on his truck, harness,dbw tb,tac module, and pedal ur best bet is to pull it from a salvage yard and dont forget the harness from the pedal to the tac module. Btw putting the pedal in sucks.

My pedal just bolted in.

[sonnychills]

That'd be awesome if mine will just bolt in. But the way my luck is going probably not. Haha all good though. I really hope it works after this!!!

[Botlfed]

some do and some dont devin, we just welded simons in

[sonnychills]

Is thee a difference between 03-06 in the tac module, pedal and harness. Or are the all the same? Does it have to come out of a truck or does it even matter?

[Frenchy]

TAC modules are one of those things that should be year specific to the tune. I'm running an 05 calibration, so I'm running an 05 TAC. Physically on the outside they're all the same. As far as the trucks go.

[Lextech]

As far as I know the 03-05 DBW parts are the same. I won't swear to it but, I think so.

Jeff

[00_Silverado_Z71]

My pedal just bolted in.

He's referring to my truck and mine did not just bolt in I had to take the entire dash out to remove the whole pedal assembly from the firewall my old gas pedal had to be cut off and then we had to modify the mounting bracket to bolt the new pedal to. Not sure if its because my truck is a standard or not but it was just a pain. When I went to the salvage yard I removed the DBW stuff from the same year truck as mine an 04 and even a standard truck and I wouldn't of imagined they made that much different stuff in the same year but how it was the the salvage yard 04 was no where near how my truck is.