Ls swap using only P0411 ECM, no black box

bluecheby said:

So I am going to swap a built 5.3 into my 1997 extended cab and Would like to swap the P0411 as well. I know this has been done plenty of times but what I find everywhere is leaving the black box installed and piggy backing a P0411 ecm to run the LS engine while the Blackbox runs the truck side of things. I understand you could put a van tune on the p0411 to run the truck side but could you modify a van tune to run a LS engine? I have HP tuners for my fbody already and have some experience using it. Ide like to make the complete swap as clean as possible and if I could have just the one ecm mounted in the stock location that would be great. Anyone done this already? Thanks

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df2x4 said:

I don't think I've ever seen an LS swap in a '96+ truck where someone left the original black box PCM in place for anything... I was under the impression that pretty much everyone doing an LS/0411 swap in a '96+ eliminated the black box entirely.

Have you seen @Lextech's thread? If you contact him with your truck info and what you're trying to do he can send you all the necessary info to re-pin your existing wiring harness to work with the 0411. I believe he can provide a base tune on an 0411 PCM as well. He sent me the pinout for swapping an LQ4/4L80E with an 0411 into my '97 C1500 some years back, I still haven't started the swap.

https://www.gmt400.com/threads/12200411-pcm-swap-for-1996-to-2000-gmt400-trucks.9644/

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bluecheby said:

I have contacted Lextech and got a pinout diagram but I didn't tell him I was doing a LS and 4l80 swap at that time. As far as I can tell though it's the same deal. I just need to change out my harness from what feedback I've gotten so far. My big question is, when I put the van tune on the p0411 to run the truck side, it will be looking for 5.7 vortec sensor inputs rather than 5.3 LS vortec inputs. For example the 5.7 has a single ignition coil while the LS has 8 coils. I would need to modify the van tune to run the LS engine, is that doable with HP tuners.

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