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  1. DAVe3283

    Considering DD'ing 350k mile LB7?

    Personally, I think it is.
  2. DAVe3283

    Considering DD'ing 350k mile LB7?

    That's the main difference, and they can be cheaper sometimes (supply and demand I guess). If it has the LBZ regulator on it, it will need a tune adjustment to run right, and it will be a bit of a pain to plug in. But it sounds like you'll want a tune either way. Just load up the LBZ regulator...
  3. DAVe3283

    Considering DD'ing 350k mile LB7?

    I've never seen SAC00's in real life, but what they claim is they are so similar to the stock VCO injectors that it doesn't need a tune, and is even CARB legal. If that is true, no need to modify the tune! But how true is that? Time will tell. My brother's truck sees about the same mileage...
  4. DAVe3283

    Considering DD'ing 350k mile LB7?

    Correct, that tune should work fine with SAC00's. My brother put SAC45's in his truck (we got tired of waiting for the SAC00's to launch) and I had to make a few changes to the tune. It runs great down to ~50°F (coldest it has been since injectors were installed), but I don't want to call it...
  5. DAVe3283

    Considering DD'ing 350k mile LB7?

    You can achieve your goal really easily on a LB7. This tune, lift pump, boost increase valve, and EGR blocker plate (or it might blow the valve open) did 425 HP / 748 lb-ft at the tires, which is more HP at the tires than the new trucks make at the crank. I run that tune in my Suburban and my...
  6. DAVe3283

    Oil cooling

    When you do, can you please post what the threads are on both the old and 2020 coolers? Which manifold do you have, the LB7/LLY/LBZ/LMM or the LML? I have the LML manifold on my truck, and the heat shields are different from the stock LB7. Curious if I'll for sure run into the same clearance...
  7. DAVe3283

    Considering DD'ing 350k mile LB7?

    The big things on the LB7 are injectors, head gaskets if coolant hasn't been changed on time (and sometimes they go just because), and CP3 (just due to miles they get weak). The electronics are pretty reliable in my experience. While you are in doing injectors, just get some friction tape and...
  8. DAVe3283

    Could use some prayers for a friends family

    Sorry to hear, said a prayer for the family. Sometimes I forget to be thankful for the time I have with the people I love. Life can be too quick sometimes.
  9. DAVe3283

    Where to buy an OBD2 connector

    Is this for a standalone swap or ??? If the factory port was damaged, you can just replace the piece(s) that are broken. For swaps or add-on ports, I just buy new Delphi (now Aptiv) connectors & pins. Generic connector body with mounting ears: 12110250 ($1.05 on Mouser) The OEM connector...
  10. DAVe3283

    LMM: Engine Assembly Questions

    RockAuto has both ACDelco (factory) gaskets and Mahle gaskets in Grade A. They may list them as 0.95mm instead of Grade A, but that's the same thing. If they don't ship to Australia, see if there are any local Mahle / Victor Reinz dealers. I usually buy my gaskets through Henry @ Creatures of...
  11. DAVe3283

    Have 1 more for you guys

    If it turns out to be flash boiling, you can go to a bigger electric pump to get some pressure in the block, or go back to a mechanical water pump. Do you have any kind of restrictor besides the thermostats? How is your bypass setup? Most people are able to make a mechanical pump work. What...
  12. DAVe3283

    Have 1 more for you guys

    Like people are saying, pressure test your cooling system. If your cooling system holds pressure, you can try a reverse pressure test. That is how I found my cracked heads. Vehicle stone cold. This is important or you get false results. Put the pressure test gauge on the cooling system, but...
  13. DAVe3283

    Silicone heater hoses

    Silicone hoses are generally not recommended for street / DD applications. Most people seem to have your problems with them, where the clamps need tightened constantly or they leak. I have read that silicone hoses are actually somewhat permeable by water, so you slowly lose water from your...
  14. DAVe3283

    Very Low oil pressure(4psi)

    When the turbo blew, did you cap the turbo oil line afterwards? If that is flowing too much oil, it could drop the oil pressure for the whole motor.
  15. DAVe3283

    LMM: Engine Assembly Questions

    You could always go back to your machine shop and ask them what they did. Did they move the crank centerline when boring the mains? It could just be the new pistons, but mine are the same CR and didn't drop the protrusion out of spec like that. Have you triple-checked your measurements? All...
  16. DAVe3283

    Exhaust Rapping??

    My built LB7 sounds very similar above 2600 RPM and under load. Fixed single turbo on mine. I think a high-lift cam and some decent cylinder pressure leads to the exhaust "rasp", which is why it tracks with load, not just RPM. A VGT would mask that quite a bit. Yours sounds a bit louder / more...
  17. DAVe3283

    Allison 5sp: Grey TCM plug

    The difference is what wire gauge they are designed for. 12084912 "large = 0.80 mm², or about 18 gauge 12084913 "small" = 0.50-0.35 mm², or about 20-22 gauge
  18. DAVe3283

    Allison 5sp: Grey TCM plug

    You can get them on Mouser. The GM part number is 15305371 ($2.27 ea), but it appears 12129025 is a new number for it and is cheaper ($1.61). You can look on Aptiv (Delphi)'s website to see the terminals you need. You will also need: 12129026 Seal ($4.46) 12129023 Retainer ($0.93, blue, can't...
  19. DAVe3283

    01-10 steering box redhead ,PSC ,OEM

    Thanks for posting this! I run 315/70R17 tires (about 35") and have the same problems as you. I have a red head box that is also about done, so I will be pulling it off sooner than later. I like the looks of that XD box quite a lot. Might have to do the same thing. I guess you swapped the PSC...
  20. DAVe3283

    Truck issue with codes

    The ignition switch might be sending less voltage than it should to the TCM, causing the TCM to behave oddly. They don't usually fail completely, you start getting weird stuff like this. If the TCM from the parts store was already programmed, perhaps it was actually a used unit someone...
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