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  1. G

    03 LB7 to 05 LLY

    So, I've completed my lb7 to lly swap, replaced the wiring harnes, the nsbu switch and ecm. The truck fires right up, but runs like crap. The idle fluctuates, the throttle does not respond, the oil pressure Guage reads 0 (has 80 psi) and the computer is throwing a code p0642. I have swapped...
  2. G

    03 LB7 to 05 LLY

    I have the under hood harness that plugs into the ecm. I appreciate the info. Didn't know about the backup switch, just ordered one. Also didn't know about the vats relearn. I have 2 05 ecm's. One should be stock and the other has had the egr delete done and the fuel sender tweek. Maybe...
  3. G

    03 LB7 to 05 LLY

    the engine harness is on the 05 engine. The ecm's are different with different plugs. Would you be talking about changing the under hood harness?
  4. G

    03 LB7 to 05 LLY

    Not sure where to post this so hopefully I'll get some help from someone out there. Everything I read about swapping an 05 LLY into my 03 GMC LB7 is that all I need to do is, swap over the engine with engine harness and swap the ECM. I have read the fuel guage value swap. I got the engine...
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