2000 5.7 vortex swap for 92 454 tbi help!

[7popeye7]

Hello gentleman , new to site hoping to get some help, I have undergone the motor and trans swap on a 2000 3500, the 5.7 motor was shot and had a 92 454 motorhome donor, I thought I had read it was reasonably simple swap as far as harness to goes but doesn't appear to be , has anyone done this swap and have any helpful advice ? So far they both had 4l80 e trans and those are simple as far as tail piece swap, I haven't checked but read about exhaust changes . What's the biggest hurdle ? Thanks in advance !

 

[618 Syndicate]

You're trying to put a 92 454 into a 00 truck, correct?

 

[7popeye7]

Yes, already swapped, now addressing harness, and as far as I could tell the best course of action was to just swap harnesses at this point and so I have almost completely removed orig harness on 2000..

 

[BeXtreme]

Yes, already swapped, now addressing harness, and as far as I could tell the best course of action was to just swap harnesses at this point and so I have almost completely removed orig harness on 2000..

You can't run a 454 TBI motor on a 5.7 vortec computer and harness. You would need the computer and harness from the donor, but I also see you are in CA... so how do you plan on passing smog with an OBDI TBI computer and 454 instead of an OBDII 5.7?

 

[fancyTBI]

You are in for a lot of work my guy. Doable, but a lot of work.