This.I don't know where this info is coming from but I don't believe it's accurate. The '99-'00 "classic" GMT400s should have the same black box PCM and harness as a '98. The GMT800s all got 0411s or similar.
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This.I don't know where this info is coming from but I don't believe it's accurate. The '99-'00 "classic" GMT400s should have the same black box PCM and harness as a '98. The GMT800s all got 0411s or similar.
Nope.I think the catch is with my suburban being a 99 model gmt400 they may have gave that extra Obs year the 99-02 NBS connector design and box even tho it’s gmt 400
I’m telling you straight forward I pulled a matching service No.16263694 black box from a 99 NBS 4.3L silverado today that’s the same Box externally visually as my 99’ suburban the connectors are gray on the nbs box that’s the difference and the wiring looms out of the connectors on the left side “toward the core support side of the connectors because the nbs trucks place the box down off the driver side fender toward the core support. Which you probably know already just sayin..Nope.
No bs i don’t know where someone’s info is coming from but there was a 99 and 2000 year NBS in front of me / I pulled the plastic cover off both of them exposed 2 black boxes with the same service number. I just chose to take the 99 4.3L boxThis.
I was just thinking this. V6 didn’t change a whole lot to my knowledge so they could probably save some costs by avoiding converting to the 0411 early on.It's possible the early V6 trucks had the black box still, but the 02 V6 NBS I owned was definitely not a black box ECM.
Why can’t you just use the existing one from the truck that has these converter issues? You are making this way more difficult than it needs to be.
Why because I drive this truck daily ! I need to retain a working PCM unit .Why can’t you just use the existing one from the truck that has these converter issues? You are making this way more difficult than it needs to be.
Pick one of the two following:
1) Replace the Y pipe with a new one, drive.
2) replace the converters with new exhaust pipe, get a tune for the O2 sensors, drive.
If you’re planning on doing a lot more engine modifications, yeah the 0411 is probably a good option. If you want to just tune out the O2, use what you have already.
It doesn’t help that your posts are hard to follow man. I think having some clearer responses would help everyone and most importantly, help you!
Yes you nailed it , I have no knowledge and never have tune, but I’m at this point ready to learn myself. My box was being sent out to somebody to be tuned. Yes, that is why I needed to keep my box in my truck to drive to work yes, in the meanwhile, collecting all the cat converters and components to fix my exhaust you nailed it !!X2.
If you're disabling the rear O2 sensors in the tune yourself using HPTuners or similar then step one is to back up your existing stock tune to a file on the computer. That way if you ever want to go back to stock you can just re-flash that file to the PCM. This is a 5-10 minute job and easier than physically swapping the PCMs IMO. The only reason for an extra PCM would be if you're having it tuned by someone else and don't have access to the software.