2000_SS

iTrader: (24)

swapping a heads/cam 2000 LS1, the ECM from the donor camaro, & TH400 into a 2003 Silverado with a 4.3/4L60.

Which engine harness should i use? i have one from a 2002 Silverado 5.3. The issue is, 2003 was the first year of DBW throttles but the 4.3 is still cable driven. The LS1 is cable obviously and the truck's owner would like to keep it that way. Is there anyway to make this setup work with the truck and its gauge cluster, or do i need to do some wiring or just find a different harness/computer? i'm trying real hard not to have to get a '03 harness, DBW TB/intake, and TAC module, but i don't see an easy way to interface the '02 harness with the '03 truck's body harness/fuse box. I make standalone harnesses from time to time but i'm not sure what (if anything) i can do with what i have.

lsx_production

wat??? please reword to make more sense.

2000_SS

iTrader: (24)

I'm not sure what's confusing about it. ...2000 ls1 going into a 2003 4.3 silverado. ...what harness do I need to make it work as a drive by cable throttle body?

1FastBrick

iTrader: (17)

Use an 03 up harness and re-pin the connector from the DBW for the cable Throttle body connectors. Then flash in a Van OS from the same year as the vans were cable operated.

2000_SS

iTrader: (24)

Ok that sounds easy enough....I've probably got an express van OS already licensed and ready to go....that won't be a problem in the f-body ecm? Its not a 0411 ecm, i can't remember which it is though off the top of my head.

1FastBrick

iTrader: (17)

It will need to be a 1MB PCM 03 - up

Application is not as critical truck, car, van, so on. As long as it is an LS1B 1 MB PCM

I would reflash the 03 Trucks PCM.